fix(FEC-11713): playback rate options are overlaid by dual screen menu (

#4252)

**the issue:**
some playback rate options are overlaid by dual screen menu and can't be chosen.

**solution:**
moving z-index from .controlBarContainer.hover to .controlBarContainer css class.

Solves FEC-11713

skins/kdark/css/layout.css

@@ -247,6 +247,7 @@ body {
 	position: absolute;
 	bottom: 0;
 	width: 100%;
+	z-index: 100;
 
 	-webkit-transition: bottom 0.3s ease-in, visibility 0.3s ease-in, opacity 0.3s ease-in;
 	-moz-transition: bottom 0.3s ease-in, visibility 0.3s ease-in, opacity 0.3s ease-in;
@@ -262,7 +263,6 @@ body {
 
 .controlBarContainer.hover {
 	opacity: 0;
-	z-index: 100;
 }
 .controlBarContainer.open {
 	opacity: 1;