fix(data): null gsmarena image_url on 2,528 phones, tablets and watches (2003–2017)

Host: cdn2.gsmarena.com. GSMArena is citation-correction only (ADR-013).
These URLs hotlinked product photos from a third-party site we hold no
license for, and the site rendered them on public device pages. Only
Wikimedia Commons files (with image_license/image_attribution) are kept;
the nulled records stay eligible for a later Commons photo backfill.

Refs #296

Author: Seungpyo1007

data/smartphone/acer/2009/betouch-e100/acer-betouch-e100.json

@@ -35,7 +35,7 @@
   ],
   "soc": "qualcomm-msm7225-snapdragon-s1",
   "raw_price": "About 180 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-be-touch-e100.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2009/betouch-e101/acer-betouch-e101.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-msm7225-snapdragon-s1",
   "raw_price": "About 170 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-be-touch-e101.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2009/betouch-e200/acer-betouch-e200.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-msm7225-snapdragon-s1",
   "raw_price": "About 190 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-be-touch-e200.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2009/liquid/acer-liquid.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-qsd8250-snapdragon-s1",
   "raw_price": "About 90 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-liquid-new.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2009/neotouch/acer-neotouch.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-qsd8250-snapdragon-s1",
   "raw_price": "About 210 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-neo-touch-new.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2010/betouch-e130/acer-betouch-e130.json

@@ -34,7 +34,7 @@
   ],
   "soc": "st-ericsson-pnx6715",
   "raw_price": "About 90 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-130-ofic.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2010/liquid-e/acer-liquid-e.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-qsd8250-snapdragon-s1",
   "raw_price": "About 90 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-liquid-e-new.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2010/liquid-mt/acer-liquid-mt.json

@@ -35,7 +35,7 @@
   ],
   "soc": "qualcomm-msm7230",
   "raw_price": "About 70 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-liquid-metal-ofic.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2010/neotouch-p300/acer-neotouch-p300.json

@@ -34,7 +34,7 @@
   ],
   "soc": "qualcomm-msm7225-snapdragon-s1",
   "raw_price": "About 80 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-p300.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",

data/smartphone/acer/2010/stream/acer-stream.json

@@ -37,7 +37,7 @@
   ],
   "soc": "qualcomm-qsd8250-snapdragon-s1",
   "raw_price": "About 130 EUR",
-  "image_url": "http://cdn2.gsmarena.com/vv/bigpic/acer-liquid-stream-ofic.jpg",
+  "image_url": null,
   "cameras": [
     {
       "type": "main",