fix(YouTube): Do not show fullscreen black gradient with 21.03+ experimental app targets

Co-authored-by: LisoUseInAIKyrios <118716522+lisouseinaikyrios@users.noreply.github.com>

patches/src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/Fingerprints.kt

@@ -126,3 +126,10 @@ internal val BytecodePatchContext.playerControlsButtonStrokeFeatureFlagMethod by
     parameterTypes()
     instructions(45713296L())
 }
+
+internal val BytecodePatchContext.playerOverlayOpacityGradientFeatureFlagMethod by gettingFirstMethodDeclaratively {
+    accessFlags(AccessFlags.PUBLIC, AccessFlags.FINAL)
+    returnType("Z")
+    parameterTypes()
+    instructions(45729621L())
+}

patches/src/main/kotlin/app/revanced/patches/youtube/misc/playercontrols/PlayerControlsPatch.kt

@@ -307,5 +307,11 @@ val playerControlsPatch = bytecodePatch(
                 playerControlsButtonStrokeFeatureFlagMethod.returnLate(false)
             }
         }
+
+        if (is_21_03_or_greater) {
+            // If enabled it can show a black gradient on lower part of screen in fullscreen mode.
+            // This override may not be needed if the new bold player overlay icons are in use.
+            playerOverlayOpacityGradientFeatureFlagMethod.returnLate(false)
+        }
     }
 }