fix: restore FlowStyle, rename hoverBackground to background

Author: zqq-dora

qt6/src/qml/overridable/InWindowBlur.qml

@@ -10,8 +10,8 @@ Item {
     id :control
     property bool offscreen: false
     property alias radius: blur.blurMax
-    property alias multiplier: blur.blurMultiplier
     property alias saturation: blur.saturation
+    property alias multiplier: blur.blurMultiplier
     property alias content: blur
     default property alias data: blitter.data
     property alias valid: blitter.blitterEnabled