Update 400_explain_discrepancy_report.yml

Author: kr11

.github/ISSUE_TEMPLATE/400_explain_discrepancy_report.yml

@@ -1,6 +1,6 @@
 name: "📊 EXPLAIN Discrepancy Report"
 description: Report differences between VIDEX and MySQL/Percona/MariaDB query plans
-labels: [ "discrepancy", "explain" ]
+labels: [ "discrepancy"]
 body:
   - type: dropdown
     attributes:
@@ -139,4 +139,4 @@ body:
         - Configuration differences
         - Expected behavior based on documentation
     validations:
-      required: false
+      required: false