Remove feature flag PictureInPicture

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -120,13 +120,6 @@ enum class FeatureFlags(
         defaultValue = { true },
         isFinished = false,
     ),
-    PictureInPicture(
-        key = "feature.pictureInPicture",
-        title = "Picture in Picture for Calls",
-        description = "Allow the Call to be rendered in PiP mode",
-        defaultValue = { it.buildType != BuildType.RELEASE },
-        isFinished = false,
-    ),
     PinnedEvents(
         key = "feature.pinnedEvents",
         title = "Pinned Events",