git: Reuse more code from vcsbase

Change-Id: I873d2caa2cead5c339eec887a5fcdef4d33bec24
Reviewed-on: http://codereview.qt-project.org/6071
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/gitversioncontrol.cpp

@@ -65,7 +65,7 @@ QString GitVersionControl::id() const
 bool GitVersionControl::isConfigured() const
 {
     bool ok = false;
-    m_client->settings().gitBinaryPath(&ok);
+    m_client->gitBinaryPath(&ok);
     return ok;
 }