fix(kb): remove dead interval branch when re-enabling connector

When `updates.nextSyncAt === undefined`, syncIntervalMinutes was not in
the request, so `parsed.data.syncIntervalMinutes` is always undefined.
Simplify to just schedule an immediate sync — the sync engine sets the
proper nextSyncAt based on the connector's DB interval after completion.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/app/api/knowledge/[id]/connectors/[connectorId]/route.ts

@@ -226,12 +226,7 @@ export async function PATCH(request: NextRequest, { params }: RouteParams) {
         updates.consecutiveFailures = 0
         updates.lastSyncError = null
         if (updates.nextSyncAt === undefined) {
-          const interval = parsed.data.syncIntervalMinutes
-          if (interval && interval > 0) {
-            updates.nextSyncAt = new Date(Date.now() + interval * 60 * 1000)
-          } else {
-            updates.nextSyncAt = new Date()
-          }
+          updates.nextSyncAt = new Date()
         }
       }
     }