Git: Fix commit message highlighting

Fixes the following pattern:

    Subject

    # comment

    Another line - considered as subject

Change-Id: I708521efde886c6f5be748795251ce0aafc8f590
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitsubmiteditorwidget.cpp

@@ -88,6 +88,7 @@ void GitSubmitHighlighter::highlightBlock(const QString &text)
         return;
     } else if (text.startsWith(m_hashChar)) {
         setFormat(0, text.size(), m_commentFormat);
+        setCurrentBlockState(state);
         return;
     } else if (state == None) {
         state = Header;