OS X: Default to the 'breeze' icon theme.

As agreed in the Design team meeting today.

Change-Id: I660462fb7b56eb3c8f883f8540cf88801e48165c
Reviewed-on: https://gerrit.libreoffice.org/16065Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Tested-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

vcl/source/app/IconThemeSelector.cxx

@@ -63,7 +63,7 @@ IconThemeSelector::GetIconThemeForDesktopEnvironment(const OUString& desktopEnvi
         r = "breeze";
     }
     else if ( desktopEnvironment.equalsIgnoreAsciiCase("MacOSX") ) {
-        r = "sifr";
+        r = "breeze";
     }
     else {
         r = FALLBACK_ICON_THEME_ID;