Add a default LocaleProduct of "browser".

tools/tinderbox/tinder-defaults.pl

@@ -175,6 +175,7 @@ $ShellOverride = '';
 
 # Release build options
 $ReleaseBuild  = 1;
+$LocaleProduct = "browser";
 $shiptalkback  = 1;
 $ReleaseToLatest = 1; # Push the release to latest-<milestone>?
 $ReleaseToDated = 1; # Push the release to YYYY-MM-DD-HH-<milestone>?