Unignore android for previously spuriously failing test.

Will see if this start failing again, in which case we'll re-ignore the test.

Author: Mark-Simulacrum

src/test/run-pass/out-of-stack.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-android: FIXME (#20004)
 // ignore-musl
 // ignore-asmjs