Remove breaks to fix warnings

clang warns these can never be hit, which is true.  Remove them.

Change-Id: I37b2bc4253e98257ec08f65e2c9de2ce2fd17706
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/redfish-core/lib/account_service.hpp b/redfish-core/lib/account_service.hpp
index 04edad1..3e9983e 100644
--- a/redfish-core/lib/account_service.hpp
+++ b/redfish-core/lib/account_service.hpp
@@ -1334,22 +1334,18 @@
         {
             return CertificateMappingAttribute::CommonName;
         }
-        break;
         case MTLSCommonNameParseMode::Whole:
         {
             return CertificateMappingAttribute::Whole;
         }
-        break;
         case MTLSCommonNameParseMode::UserPrincipalName:
         {
             return CertificateMappingAttribute::UserPrincipalName;
         }
-        break;
         default:
         {
             return CertificateMappingAttribute::Invalid;
         }
-        break;
     }
 }