Remove duplicate tag in C Pointers1 meta data

Author: rvermeulen

c/misra/src/rules/RULE-4-8/ObjectWithNoPointerDereferenceShouldBeOpaque.ql

@@ -10,7 +10,6 @@
  * @tags external/misra/id/rule-4-8
  *       readability
  *       maintainability
- *       readability
  *       external/misra/obligation/advisory
  */
 

rule_packages/c/Pointers1.json

@@ -308,8 +308,7 @@
           "short_name": "ObjectWithNoPointerDereferenceShouldBeOpaque",
           "tags": [
             "readability",
-            "maintainability",
-            "readability"
+            "maintainability"
           ],
           "implementation_scope": {
             "description": "This rule considers all cases where a structure or union is referenced as a pointer but has no FieldAccess within a translation unit. Further excluded from this rule are translation units in which the structure or union is declared as a non-pointer variable."