Clean headers in Git.

Ran script to remove inludes on a trial-and-error basis and
manually corrected it.

Change-Id: Ib2afbc530760684db96888b927c5153b29fe24aa
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gerrit/gerritoptionspage.cpp

@@ -37,7 +37,6 @@
 #include <QSpinBox>
 #include <QCheckBox>
 #include <QFormLayout>
-#include <QVBoxLayout>
 
 namespace Gerrit {
 namespace Internal {