CI: Stop running ignored tests

This got introduced in 2e3004f89e, but
there should be no reason to run ignored tests; if they are #[ignore]
it’s probably for a good reason.

This is particularly annoying with doctests, where ignore is used to
explicitly highlight broken/untested code.

Thanks jonas’ for noticing!

.gitlab-ci.yml

@@ -31,7 +31,7 @@ variables:
 .test:
   stage: test
   script:
-    - cargo test --verbose --release -- --include-ignored
+    - cargo test --verbose
     - cargo test --verbose --no-default-features
   rules:
     - if: $CI_PIPELINE_SOURCE == 'merge_request_event'