tests: update tests/ui/issues/issue-2190-1.rs

- Convert `run-pass` to `check-pass`, the test is about closure
  inference based on expected type, does not need to run-pass.
- Dropped unnecessary ignores.

tests/ui/issues/issue-2190-1.rs

@@ -1,20 +1,16 @@
-//@ run-pass
-#![allow(unused_must_use)]
-#![allow(non_upper_case_globals)]
-
-//@ ignore-emscripten no threads
+//@ check-pass
 
 use std::thread::Builder;
 
-static generations: usize = 1024+256+128+49;
+static GENERATIONS: usize = 1024+256+128+49;
 
 fn spawn(mut f: Box<dyn FnMut() + 'static + Send>) {
-    Builder::new().stack_size(32 * 1024).spawn(move|| f());
+    Builder::new().stack_size(32 * 1024).spawn(move || f());
 }
 
 fn child_no(x: usize) -> Box<dyn FnMut() + 'static + Send> {
-    Box::new(move|| {
-        if x < generations {
+    Box::new(move || {
+        if x < GENERATIONS {
             spawn(child_no(x+1));
         }
     })