remove ATOMIC_VAR_INIT

Summary:
ATOMIC_VAR_INIT is deprecated in C17, and does nothing anyway.

Changelog:
[iOS][Fixed] - Remove deprecated ATOMIC_VAR_INIT macro in RCTProfile.m

Reviewed By: NSProgrammer

Differential Revision: D74002901

fbshipit-source-id: e453fbc084cd0b1049c7f8b052c9779d9b19b44f

Author: rmaz

packages/react-native/React/Profiler/RCTProfile.m

@@ -42,7 +42,7 @@
 
 #pragma mark - Variables
 
-static atomic_bool RCTProfileProfiling = ATOMIC_VAR_INIT(NO);
+static atomic_bool RCTProfileProfiling = NO;
 
 static NSDictionary *RCTProfileInfo;
 static NSMutableDictionary *RCTProfileOngoingEvents;