6808: Poor contrast mouse on mouse over

Set the Gnome-standard 'Adwaita' theme, which doesn't have gray lines.

mac/gramps.modules

@@ -64,6 +64,7 @@ gtk-mac-bundler gtk-osx-build/projects/gramps/gramps.bundle
 	    checkoutdir="gramps-git"/>
     <dependencies>
       <dep package="meta-gtk-osx-python-gtk3"/>
+      <dep package="meta-gtk-osx-gtk3-core-themes"/>
       <dep package="goocanvas2"/>
       <dep package="librsvg"/>
       <dep package="shared-mime-info"/>
@@ -81,7 +82,7 @@ gtk-mac-bundler gtk-osx-build/projects/gramps/gramps.bundle
     <branch module="gramps-addons/trunk/contrib"
 	    repo="gramps-addons"/>
     <dependencies>
-      <dep package="gramps-svn"/>
+      <dep package="gramps-git"/>
     </dependencies>
   </distutils>