Move some issues-* tests to better homes

These tests were updated in the previous commit; while they are being
cleaned up, move them to a non-issue directory.

src/tools/tidy/src/issues.txt

@@ -2071,7 +2071,6 @@ ui/issues/issue-32782.rs
 ui/issues/issue-32797.rs
 ui/issues/issue-32805.rs
 ui/issues/issue-3290.rs
-ui/issues/issue-32950.rs
 ui/issues/issue-32995-2.rs
 ui/issues/issue-32995.rs
 ui/issues/issue-33202.rs
@@ -2341,7 +2340,6 @@ ui/issues/issue-49934.rs
 ui/issues/issue-49955.rs
 ui/issues/issue-49973.rs
 ui/issues/issue-50187.rs
-ui/issues/issue-50403.rs
 ui/issues/issue-50411.rs
 ui/issues/issue-50415.rs
 ui/issues/issue-50442.rs

src/tools/tidy/src/ui_tests.rs

@@ -17,7 +17,7 @@
 const ENTRY_LIMIT: u32 = 901;
 // FIXME: The following limits should be reduced eventually.
 
-const ISSUES_ENTRY_LIMIT: u32 = 1623;
+const ISSUES_ENTRY_LIMIT: u32 = 1619;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files

tests/ui/derives/nonsense-input-to-debug.stderr

@@ -1,11 +1,11 @@
 error: `derive` cannot be used on items with type macros
-  --> $DIR/issue-32950.rs:7:22
+  --> $DIR/nonsense-input-to-debug.rs:7:22
    |
 LL |     should_be_vec_t: vec![T],
    |                      ^^^^^^^
 
 error: expected type, found `expr` metavariable
-  --> $DIR/issue-32950.rs:7:22
+  --> $DIR/nonsense-input-to-debug.rs:7:22
    |
 LL |     should_be_vec_t: vec![T],
    |                      ^^^^^^^
@@ -17,7 +17,7 @@ LL |     should_be_vec_t: vec![T],
    = note: this error originates in the macro `vec` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0392]: type parameter `T` is never used
-  --> $DIR/issue-32950.rs:5:17
+  --> $DIR/nonsense-input-to-debug.rs:5:17
    |
 LL | struct Nonsense<T> {
    |                 ^ unused type parameter

tests/ui/macros/macro-metavar-expr-concat/empty-input.stderr

@@ -1,11 +1,11 @@
 error: expected identifier or string literal
-  --> $DIR/issue-50403.rs:6:14
+  --> $DIR/empty-input.rs:6:14
    |
 LL |     () => { ${concat()} }
    |              ^^^^^^^^^^
 
 error: expected expression, found `$`
-  --> $DIR/issue-50403.rs:6:13
+  --> $DIR/empty-input.rs:6:13
    |
 LL |     () => { ${concat()} }
    |             ^ expected expression