Bug 1930903 - Add png variants of about logo. r=mkmelin,arschmitz

Differential Revision: https://phabricator.services.mozilla.com/D228800

--HG--
extra : moz-landing-system : lando

mail/branding/nightly/jar.mn

@@ -6,7 +6,9 @@
 messenger.jar:
 % content branding %content/branding/
   content/branding/about-background.png             (content/about-background.png)
+  content/branding/about-logo.png                   (content/about-logo.png)
   content/branding/about-logo.svg                   (content/about-logo.svg)
+  content/branding/about-logo@2x.png                (content/about-logo@2x.png)
   content/branding/about-wordmark.svg               (content/about-wordmark.svg)
   content/branding/about.png                        (content/about.png)
   content/branding/icon32.png                       (default32.png)

mail/branding/tb_beta/jar.mn

@@ -5,7 +5,9 @@
 
 messenger.jar:
 % content branding %content/branding/
+  content/branding/about-logo.png                   (content/about-logo.png)
   content/branding/about-logo.svg                   (content/about-logo.svg)
+  content/branding/about-logo@2x.png                (content/about-logo@2x.png)
   content/branding/about-wordmark.svg               (content/about-wordmark.svg)
   content/branding/about.png                        (content/about.png)
   content/branding/icon32.png                       (default32.png)

mail/branding/thunderbird/jar.mn

@@ -5,7 +5,9 @@
 
 messenger.jar:
 % content branding %content/branding/
+  content/branding/about-logo.png                   (content/about-logo.png)
   content/branding/about-logo.svg                   (content/about-logo.svg)
+  content/branding/about-logo@2x.png                (content/about-logo@2x.png)
   content/branding/about-wordmark.svg               (content/about-wordmark.svg)
   content/branding/about.png                        (content/about.png)
   content/branding/icon32.png                       (default32.png)