Don't make the primary location show up twice

Author: jeongsoolee09

cpp/misra/src/rules/RULE-12-3-1/UnionKeywordUsed.ql

@@ -18,4 +18,4 @@ import codingstandards.cpp.misra
 
 from Union u
 where not isExcluded(u, BannedSyntaxPackage::unionsUsedQuery())
-select u, "$@ is a union which is prohibited.", u, u.getName()
+select u, "'" + u.getName() + "' is a union which is prohibited."

cpp/misra/test/rules/RULE-12-3-1/UnionKeywordUsed.expected

@@ -1,3 +1,3 @@
-| test.cpp:4:9:4:9 | u | $@ is a union which is prohibited. | test.cpp:4:9:4:9 | u | u |
-| test.cpp:13:9:13:9 | u | $@ is a union which is prohibited. | test.cpp:13:9:13:9 | u | u |
-| test.cpp:20:7:20:7 | u | $@ is a union which is prohibited. | test.cpp:20:7:20:7 | u | u |
+| test.cpp:4:9:4:9 | u | 'u' is a union which is prohibited. |
+| test.cpp:13:9:13:9 | u | 'u' is a union which is prohibited. |
+| test.cpp:20:7:20:7 | u | 'u' is a union which is prohibited. |