UI: Fix scrollbar misalignment for Acri theme

Fixes an issue with horizontal scrollbar when it was hard to drag it by
mouse in Acri theme, because active area was thinner than the visible
scroll handle.

UI/data/themes/Acri.qss

@@ -283,7 +283,7 @@ QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical, QScrollBar::add-
 
 QScrollBar:horizontal {
 	background-color: transparent;
-	height: 10px;
+	height: 20px;
 	margin-left: -3px;
 	margin-right: -3px;
 }
@@ -291,7 +291,7 @@ QScrollBar:horizontal {
 QScrollBar::handle:horizontal {
 	background-color: #2f2f2f;
 	min-width: 20px;
-	margin: 0px 0px -3px;
+	margin: 3px 0px;
 	border-radius: 0px;
 	border: none;
 }