Use org.eclipse.egit branding plugin

We do not need two branding plugins for two related features
and org.eclipse.jgit is not a branding plugin.

Change-Id: Ic1c8969bbed89f693c7e11108d6baba013f71711
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit-feature/feature.xml

@@ -4,7 +4,7 @@
       label="%featureName"
       version="0.6.0.qualifier"
       provider-name="%providerName"
-      plugin="org.eclipse.jgit">
+      plugin="org.eclipse.egit">
 
    <description url="http://www.eclipse.org/egit/">
      %description