Group closure context ui tests

Author: tommyip

src/test/ui/issue-26046-fn-mut.rs renamed to src/test/ui/closure_context/issue-26046-fn-mut.rs

@@ -1,5 +1,5 @@
 error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
-  --> $DIR/issue-26046.rs:14:19
+  --> $DIR/issue-26046-fn-once.rs:14:19
    |
 14 |       let closure = move || {
    |  ___________________^
@@ -8,7 +8,7 @@ error[E0525]: expected a closure that implements the `Fn` trait, but this closur
    | |_____^
    |
 note: closure is `FnOnce` because it moves the variable `vec` out of its environment
-  --> $DIR/issue-26046.rs:15:9
+  --> $DIR/issue-26046-fn-once.rs:15:9
    |
 15 |         vec
    |         ^^^

src/test/ui/issue-26046-fn-mut.stderr renamed to src/test/ui/closure_context/issue-26046-fn-mut.stderr

@@ -1,13 +1,13 @@
 error[E0382]: use of moved value: `debug_dump_dict`
-  --> $DIR/fn_once-moved.rs:21:5
+  --> $DIR/issue-42065.rs:21:5
    |
 20 |     debug_dump_dict();
    |     --------------- value moved here
 21 |     debug_dump_dict();
    |     ^^^^^^^^^^^^^^^ value used here after move
    |
 note: closure cannot be invoked more than once because it moves the variable `dict` out of its environment
-  --> $DIR/fn_once-moved.rs:16:29
+  --> $DIR/issue-42065.rs:16:29
    |
 16 |         for (key, value) in dict {
    |                             ^^^^