Avoid running some test 2 times when unneeded (#9124)

* avoid running some test 2 times when unneeded

* Update frame/support/test/Cargo.toml

substrate/frame/support/test/tests/pallet_ui.rs

@@ -16,7 +16,6 @@
 // limitations under the License.
 
 #[rustversion::attr(not(stable), ignore)]
-#[cfg(not(feature = "conditional-storage"))]
 #[test]
 fn pallet_ui() {
 	// As trybuild is using `cargo check`, we don't need the real WASM binaries.