[kstyle] Update blur region even if Breeze has no X11 support

Summary:
KWindowEffects provides a platform-independent API for enabling blur,
which requires neither Xlib nor XCB.

Test Plan: Compiles.

Reviewers: #plasma, davidedmundson

Reviewed By: #plasma, davidedmundson

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D26631

kstyle/breezeblurhelper.cpp

@@ -89,7 +89,6 @@ namespace Breeze
     //___________________________________________________________
     void BlurHelper::update(QWidget* widget) const
     {
-        #if BREEZE_HAVE_X11
         /*
         directly from bespin code. Supposedly prevent playing with some 'pseudo-widgets'
         that have winId matching some other -random- window
@@ -103,9 +102,5 @@ namespace Breeze
         if (widget->isVisible()) {
             widget->update();
         }
-
-        #else
-        Q_UNUSED( widget )
-        #endif
     }
 }

kstyle/breezeblurhelper.h

@@ -37,10 +37,6 @@
 #include <QHash>
 #include <QObject>
 
-#if BREEZE_HAVE_X11
-#include <xcb/xcb.h>
-#endif
-
 namespace Breeze
 {
     class BlurHelper: public QObject