fixup! refactor(event cache): consolidate logic around returning the previous gap token

Author: bnjbvr

crates/matrix-sdk/src/event_cache/room/mod.rs

@@ -863,9 +863,7 @@ mod private {
             // If any in-memory chunk is a gap, don't load more events, and let the caller
             // resolve the gap.
             if let Some(prev_token) = self.events.rgap().map(|gap| gap.prev_token) {
-                return Ok(LoadMoreEventsBackwardsOutcome::Gap {
-                    prev_token: Some(prev_token.clone()),
-                });
+                return Ok(LoadMoreEventsBackwardsOutcome::Gap { prev_token: Some(prev_token) });
             }
 
             // Because `first_chunk` is `not `Send`, get this information before the