feat(Player): enable fast-forward with double tap to seek

Enables fast-forward when double tap to seek, instead of swipe gestures, as it
doesn't involve any swiping and can be used similar to double tap to seek, to
navigate through a video.

Author: FineFindus

app/src/main/java/com/github/libretube/ui/views/CustomExoPlayerView.kt

@@ -883,7 +883,7 @@ abstract class CustomExoPlayerView(
     }
 
     override fun onLongPress() {
-        if (!PlayerHelper.swipeGestureEnabled) return
+        if (!PlayerHelper.doubleTapToSeek) return
 
         backgroundBinding.fastForwardView.isVisible = true
         val player = player ?: return
@@ -905,7 +905,7 @@ abstract class CustomExoPlayerView(
     }
 
     override fun onLongPressEnd() {
-        if (!PlayerHelper.swipeGestureEnabled) return
+        if (!PlayerHelper.doubleTapToSeek) return
 
         backgroundBinding.fastForwardView.isGone = true