Plugins: Fix app child config func typo (#59386)

fix func typo

pkg/plugins/manager/loader/loader_test.go

@@ -1311,7 +1311,7 @@ func Test_setPathsBasedOnApp(t *testing.T) {
 			BaseURL:   "public/app/plugins/app/testdata-app",
 		}
 
-		configureAppChildOPlugin(parent, child)
+		configureAppChildPlugin(parent, child)
 
 		require.Equal(t, "app/plugins/app/testdata-app/datasources/datasource/module", child.Module)
 		require.Equal(t, "testdata-app", child.IncludedInAppID)