fix(qwp): restore requestSyncBeforeRotation gate clobbered by stray edit

Commit 88d6b79 accidentally captured a concurrent tooling edit that
neutralized requestSyncBeforeRotation to 'return false' (marked
'MUTANT: gate neutralized'): a mutation-testing session shared this
worktree and injected the edit between test validation and git add.
The neutralized gate allowed rotation in PERIODIC durability mode to
proceed without requesting a sync for a predecessor whose published
range was not yet durable.

This restores the original logic byte-for-byte; the worktree now
matches exactly the change set the 369-test sf suite validated.
SegmentManagerPeriodicSyncTest, SegmentManagerCrashConsistencyTest,
SegmentRingTest and MmapSegmentTest re-run green on the restoration.

Author: bluestreak01

core/src/main/java/io/questdb/client/cutlass/qwp/client/sf/cursor/SegmentRing.java

@@ -1342,7 +1342,11 @@ public synchronized void releasePinnedSegmentForTest(MmapSegment expected) {
     }
 
     private synchronized boolean requestSyncBeforeRotation(MmapSegment previous) {
-        return false; // MUTANT: gate neutralized
+        if (periodicSyncEnabled && !previous.isPublishedDurable()) {
+            syncRequested = true;
+            return true;
+        }
+        return false;
     }
 
     /** Releases the I/O cursor pin and wakes trim if it still names {@code expected}. */