fix unit test naming style

Author: chenyukang

…ep-level-Send-bound-check-issue-40827.rs …ep-level-send-bound-check-issue-40827.rstests/ui/trait-bounds/deep-level-Send-bound-check-issue-40827.rs renamed to tests/ui/trait-bounds/deep-level-send-bound-check-issue-40827.rs tests/ui/trait-bounds/deep-level-Send-bound-check-issue-40827.rs renamed to tests/ui/trait-bounds/deep-level-send-bound-check-issue-40827.rs

@@ -1,5 +1,5 @@
 error[E0277]: `Rc<Foo>` cannot be shared between threads safely
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:14:7
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:14:7
    |
 LL |     f(Foo(Arc::new(Bar::B(None))));
    |     - ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Rc<Foo>` cannot be shared between threads safely
@@ -8,24 +8,24 @@ LL |     f(Foo(Arc::new(Bar::B(None))));
    |
    = help: within `Bar`, the trait `Sync` is not implemented for `Rc<Foo>`
 note: required because it appears within the type `Bar`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:6:6
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:6:6
    |
 LL | enum Bar {
    |      ^^^
    = note: required for `Arc<Bar>` to implement `Send`
 note: required because it appears within the type `Foo`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:4:8
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:4:8
    |
 LL | struct Foo(Arc<Bar>);
    |        ^^^
 note: required by a bound in `f`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:11:9
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:11:9
    |
 LL | fn f<T: Send>(_: T) {}
    |         ^^^^ required by this bound in `f`
 
 error[E0277]: `Rc<Foo>` cannot be sent between threads safely
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:14:7
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:14:7
    |
 LL |     f(Foo(Arc::new(Bar::B(None))));
    |     - ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Rc<Foo>` cannot be sent between threads safely
@@ -34,18 +34,18 @@ LL |     f(Foo(Arc::new(Bar::B(None))));
    |
    = help: within `Bar`, the trait `Send` is not implemented for `Rc<Foo>`
 note: required because it appears within the type `Bar`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:6:6
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:6:6
    |
 LL | enum Bar {
    |      ^^^
    = note: required for `Arc<Bar>` to implement `Send`
 note: required because it appears within the type `Foo`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:4:8
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:4:8
    |
 LL | struct Foo(Arc<Bar>);
    |        ^^^
 note: required by a bound in `f`
-  --> $DIR/deep-level-Send-bound-check-issue-40827.rs:11:9
+  --> $DIR/deep-level-send-bound-check-issue-40827.rs:11:9
    |
 LL | fn f<T: Send>(_: T) {}
    |         ^^^^ required by this bound in `f`