fix(sync): don't override sliding sync v5 list range start to zero

changelog.d/1445.bugfix

@@ -0,0 +1 @@
+Fixed sliding sync v5 list ranges always starting from 0, causing extra rooms to be unnecessarily processed and returned. Contributed by @0xnim

src/api/client/sync/v5.rs

@@ -336,7 +336,9 @@ where
 		let ranges = list.ranges.clone();
 
 		for mut range in ranges {
-			range.0 = uint!(0);
+			range.0 = range
+				.0
+				.min(UInt::try_from(active_rooms.len()).unwrap_or(UInt::MAX));
 			range.1 = range.1.checked_add(uint!(1)).unwrap_or(range.1);
 			range.1 = range
 				.1