add complete black background in videoscreen, don't handle all keys in search screen

apps/vbox/client/shared/src/androidMain/kotlin/ru/shadowsparky/vbox/shared/presentation/search/SearchScreen.android.kt

@@ -13,8 +13,9 @@ actual fun Modifier.requestFocusOnDownEvent(focusRequester: FocusRequester): Mod
         if (it.type == KeyEventType.KeyUp) {
             if (it.key == Key.DirectionDown) {
                 focusRequester.requestFocus()
+                return@onKeyEvent true
             }
         }
-        true
+        false
     }
 }

feature/video-player/src/commonMain/kotlin/ru/shadowsparky/videoplayer/ui/VideoPlayer.kt

@@ -114,7 +114,7 @@ fun VideoPlayer(
         )
     }
 
-    Box(modifier = rootModifier.background(Color.Black)) {
+    Box(modifier = rootModifier.fillMaxSize().background(Color.Black)) {
         VideoCanvas(
             controller = controller,
             modifier = rootModifier.fillMaxSize(),