FakeVim: Merge comments when joining lines with 'J'

This is the default behavior in vim as well

Change-Id: Ia4d56e3cfc7f91fc353078daefaabeada9a86bed
Reviewed-by: hjk <hjk@qt.io>

src/plugins/fakevim/fakevimactions.cpp

@@ -113,6 +113,7 @@ FakeVimSettings::FakeVimSettings()
     createAction(ConfigBackspace,      QString("indent,eol,start"), "ConfigBackspace", "bs");
     createAction(ConfigIsKeyword,      QString("@,48-57,_,192-255,a-z,A-Z"), "IsKeyword", "isk");
     createAction(ConfigClipboard,      QString(), "Clipboard", "cb");
+    createAction(ConfigFormatOptions,  QString(), "formatoptions", "fo");
 
     // Emulated plugins
     createAction(ConfigEmulateVimCommentary, false, "commentary");