test: remove test-runner-watch-mode-complex flaky designation

Refs: nodejs#55006
Refs: nodejs#54807 (comment)

Author: lpinca

test/parallel/parallel.status

@@ -20,8 +20,6 @@ test-fs-read-stream-concurrent-reads: PASS, FLAKY
 test-snapshot-incompatible: SKIP
 
 [$system==win32]
-# https://github.com/nodejs/node/issues/54807
-test-runner-watch-mode-complex: PASS, FLAKY
 # https://github.com/nodejs/node/issues/54808
 test-async-context-frame: PASS, FLAKY
 # https://github.com/nodejs/node/issues/54534