[auth] Add Wargaming icon (#3529)

## Description
Adds the Wargaming.net icon to Ente Auth

auth/assets/custom-icons/_data/custom-icons.json

@@ -695,6 +695,9 @@
     {
       "title": "Vikunja"
     },
+    {
+      "title": "WARGAMING.NET"
+    },
     {
       "title": "Wealthfront"
     },

auth/assets/custom-icons/icons/wargaming.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 96 96">
+    <g style="mix-blend-mode:difference">
+        <path fill="white" fill-rule="evenodd" d="M47.77,1A47,47,0,1,1,1,48.23V48A46.87,46.87,0,0,1,47.71,1Zm0,9a38.12,38.12,0,0,1,19.13,71A82.23,82.23,0,0,0,69.84,54.5c2.44.69,3.82,1.08,6.27,1.87A128.54,128.54,0,0,0,66.2,36.09,81.28,81.28,0,0,1,53.06,54.25l7.84-.49c-6.75,12.12-16.27,18-28.33,19.71-2.75-13.71-.69-36,14.7-46.48l1.56,7.48c3-4.83,8.93-11.22,13.34-15.67a41.77,41.77,0,0,0-22.83-2.15c1.27,1.09,2.84,2.47,4.11,3.55C26.1,27.57,16.57,39.68,10.3,53.76A38.3,38.3,0,0,1,47.77,9.94Z"/>
+    </g>
+</svg>