fixup! MB 1: Mullvad Browser branding

Bug 42490: Write the browser logo SVG also outside of omni.ja.

browser/branding/branding-common.mozbuild

@@ -25,6 +25,7 @@ def FirefoxBranding():
         ]
     elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gtk':
         FINAL_TARGET_FILES.chrome.icons.default += [
+            'content/about-logo.svg',
             'default128.png',
             'default16.png',
             'default256.png',

browser/installer/package-manifest.in

@@ -228,6 +228,7 @@
 @RESPATH@/chrome/toolkit@JAREXT@
 @RESPATH@/chrome/toolkit.manifest
 #ifdef MOZ_GTK
+@RESPATH@/browser/chrome/icons/default/about-logo.svg
 @RESPATH@/browser/chrome/icons/default/default16.png
 @RESPATH@/browser/chrome/icons/default/default32.png
 @RESPATH@/browser/chrome/icons/default/default48.png