fix: browserActon icon in Chromium 80

In past we used SVG in Firefox and if that threw an error (Chromium) we
falled back to PNG. Sadly something changed around Chromium 80 and the
icon was not properly set on Chromium (including Brave)

For now we just use PNG everywhere.

add-on/src/lib/ipfs-companion.js

@@ -497,6 +497,9 @@ module.exports = async function init () {
   }
 
   async function setBrowserActionIcon (iconPath) {
+    return browser.browserAction.setIcon(rasterIconDefinition(iconPath))
+    /* Below fallback does not work since Chromium 80
+     * (it fails in a way that does not produce error we can catch)
     const iconDefinition = { path: iconPath }
     try {
       // Try SVG first -- Firefox supports it natively
@@ -508,6 +511,7 @@ module.exports = async function init () {
       // Still, we want icon, so we precompute rasters of popular sizes and use them instead
       await browser.browserAction.setIcon(rasterIconDefinition(iconPath))
     }
+    */
   }
 
   // ColorArray [0,0,0,0] → Hex #000000