Change to darker background for side bar. No Frame for list widget

Author: NathanW2

src/app/qgisappstylesheet.cpp

@@ -162,7 +162,7 @@ void QgisAppStyleSheet::buildStyleSheet( const QMap<QString, QVariant>& opts )
   if ( sidebar )
   {
      QString style = "QListWidget#mOptionsListWidget {"
-         "background-color: rgb(162, 170, 179);"
+         "background-color: rgb(69, 69, 69, 220);"
           "}"
           "QListWidget#mOptionsListWidget::item {"
           "    color: white;"

src/gui/qgsoptionsdialogbase.cpp

@@ -69,6 +69,7 @@ void QgsOptionsDialogBase::initOptionsBase( bool restoreUi )
   QSettings settings;
   int size = settings.value( "/IconSize", 24 ).toInt();
   mOptListWidget->setIconSize( QSize(size, size) );
+  mOptListWidget->setFrameStyle( QFrame::NoFrame );
 
   optionsFrame->layout()->setContentsMargins(0,3,3,3);
   QVBoxLayout* layout = static_cast<QVBoxLayout*>(optionsFrame->layout());