Fix button hover overlay colors

TODO.md

@@ -26,6 +26,7 @@
   - [hr not working](https://bugreports.qt.io/browse/QTBUG-74342)
 
 - UI
+  - Make invite/left banners look better in column mode
   - Messages editing
   - Code highlighting
   - Support GIF avatars

src/qml/Base/HBaseButton.qml

@@ -39,7 +39,7 @@ Button {
             id: buttonBackgroundOverlay
             anchors.fill: parent
             radius: parent.radius
-            color: "black"
+            color: theme.controls.button.hoveredOverlay
             opacity: 0
 
             Behavior on opacity { HNumberAnimation { factor: 0.5 } }

src/themes/Default.qpl

@@ -78,6 +78,7 @@ controls:
 
     button:
         color background:     colors.inputBackground
+        color hoveredOverlay: hsluv(0, 0, 100)
         color text:           colors.text
         color disabledText:   colors.dimmerText