ci: install modern windows style for Qt6

Author: variar

packaging/windows/klogg.nsi

@@ -123,7 +123,12 @@ Section "Qt Runtime libraries" qtlibs
     SetOutPath $INSTDIR\platforms
     File release\platforms\qwindows.dll
     SetOutPath $INSTDIR\styles
+!if ${QT_MAJOR} == "Qt6"
+    File release\styles\qmodernwindowsstyle.dll
+!else
     File release\styles\qwindowsvistastyle.dll
+!endif
+
 SectionEnd
 
 Section "MSVC Runtime libraries" vcruntime

packaging/windows/prepare_release.cmd

@@ -50,7 +50,7 @@ xcopy %QTDIR%\plugins\platforms\qwindows.dll %KLOGG_WORKSPACE%\release\platforms
 
 md %KLOGG_WORKSPACE%\release\styles
 xcopy %QTDIR%\plugins\styles\qwindowsvistastyle.dll %KLOGG_WORKSPACE%\release\styles /y
-
+xcopy %QTDIR%\plugins\styles\qmodernwindowsstyle.dll %KLOGG_WORKSPACE%\release\styles /y
 
 echo "Copying packaging files..."
 md %KLOGG_WORKSPACE%\chocolately