Run tests/ui/backtrace/std-backtrace.rs on MSVC.

the original PR which disabled these only mentions them being broken on i686. let's still make sure the rest of windows is supported.

Author: jyn514

tests/ui/backtrace/std-backtrace.rs

@@ -3,7 +3,7 @@
 //@ ignore-wasm32 spawning processes is not supported
 //@ ignore-openbsd no support for libbacktrace without filename
 //@ ignore-sgx no processes
-//@ ignore-msvc see #62897 and `backtrace-debuginfo.rs` test
+//@ ignore-i686-pc-windows-msvc see #62897 and `backtrace-debuginfo.rs` test
 //@ ignore-fuchsia Backtraces not symbolized
 //@ compile-flags:-g
 //@ compile-flags:-Cstrip=none