Fix the SQL execution error caused by tablet not being found due to Colocate join (#7002)

* fixbug sql execution sometimes due to failed to get tablet

fe/fe-core/src/main/java/org/apache/doris/qe/Coordinator.java

@@ -1234,7 +1234,7 @@ public class Coordinator {
         }
 
         for (PlanNode childNode : node.getChildren()) {
-            if (isColocateFragment(planFragment, childNode)) {
+            if (childNode.getFragmentId().asInt() == planFragment.getId().asInt() && isColocateFragment(planFragment, childNode)) {
                 return true;
             }
         }