fix ci step Rustfmt compiletests

Author: Firestar99

.github/workflows/ci.yaml

@@ -145,8 +145,8 @@ jobs:
         run: cargo fetch --locked
       - name: Rustfmt
         run: cargo fmt --all -- --check
-      - name: Rustfmt tests
-        run: rustfmt --check tests/ui/**/*.rs
+      - name: Rustfmt compiletests
+        run: shopt -s globstar && rustfmt --check tests/compiletests/ui/**/*.rs
       - name: Check docs are valid
         run: RUSTDOCFLAGS=-Dwarnings cargo doc --no-deps
       - name: Check docs for `spirv-std` and `spirv-builder` on stable (for docs.rs)