misc : re-enable share pos by default

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

@@ -176,11 +176,11 @@ enum class FeatureFlags(
         isFinished = false,
     ),
     SharePos(
-        key = "feature.share_pos",
+        key = "feature.share_pos_v2",
         title = "Share pos in sliding sync",
         description = "Keep the sliding sync pos to make initial syncs faster. Requires an app restart to take effect." +
             "\n\nWARNING: this may cause issues with syncs.",
-        defaultValue = { false },
+        defaultValue = { true },
         // False so it's displayed in the developer options screen
         isFinished = false,
     ),