🎨 Format redundant stringify test outputs

internal/metadata/repository/http/http_metadata_test.go

@@ -129,7 +129,7 @@ func TestGet(t *testing.T) {
 				scope.Und,
 				url.URL{},
 			)); diff != "" {
-				t.Errorf("%+s", diff)
+				t.Error(diff)
 			}
 		})
 	}

internal/user/repository/http/http_user_test.go

@@ -54,7 +54,7 @@ func TestGet(t *testing.T) {
 	}
 
 	if diff := cmp.Diff(user, result, cmp.AllowUnexported(domain.Me{}, domain.Email{})); diff != "" {
-		t.Errorf("%+s", diff)
+		t.Error(diff)
 	}
 }