fix warning when parsing stylesheet in qgsmessagebar:

avoid log message: "Could not parse stylesheet of widget .."

Author: slarosa

src/gui/qgsmessagebar.cpp

@@ -76,8 +76,8 @@ QgsMessageBar::QgsMessageBar( QWidget *parent )
   mCloseBtn->setToolTip( tr( "Close" ) );
   mCloseBtn->setMinimumWidth( 40 );
   mCloseBtn->setStyleSheet(
-    "QToolButton { background-color: rgba(0, 0, 0, 0); } "
-    "QToolButton::menu-button { background-color: rgba(0, 0, 0, 0); " );
+    "QToolButton { background-color: rgba(0, 0, 0, 0); }"
+    "QToolButton::menu-button { background-color: rgba(0, 0, 0, 0); }" );
   mCloseBtn->setCursor( Qt::PointingHandCursor );
   mCloseBtn->setIcon( QgsApplication::getThemeIcon( "/mIconClose.png" ) );
   mCloseBtn->setIconSize( QSize( 18, 18 ) );