Remove check_is_status=true from .flowconfig files (#56337)

Summary:
Pull Request resolved: #56337

Feature is currently always on.

## Changelog:

[internal]

Reviewed By: marcoww6

Differential Revision: D99681591

fbshipit-source-id: 82a651fea23e160dd753c2e9644d0423e6a80395

Author: panagosg7

.flowconfig

@@ -48,8 +48,6 @@ experimental.pattern_matching=true
 casting_syntax=both
 component_syntax=true
 
-check_is_status=true
-
 emoji=true
 
 exact_by_default=true