macOS: Add hint for smooth SDL_EVENT_MOUSE_WHEEL values

src/video/cocoa/SDL_cocoaevents.m

@@ -106,8 +106,10 @@ static void Cocoa_DispatchEvent(NSEvent *theEvent)
 
 + (void)registerUserDefaults
 {
+    BOOL momentumScrollSupported = (BOOL)SDL_GetHintBoolean(SDL_HINT_MAC_SCROLL_MOMENTUM, false);
+
     NSDictionary *appDefaults = [[NSDictionary alloc] initWithObjectsAndKeys:
-                                                          [NSNumber numberWithBool:NO], @"AppleMomentumScrollSupported",
+                                                          [NSNumber numberWithBool:momentumScrollSupported], @"AppleMomentumScrollSupported",
                                                           [NSNumber numberWithBool:NO], @"ApplePressAndHoldEnabled",
                                                           [NSNumber numberWithBool:YES], @"ApplePersistenceIgnoreState",
                                                           nil];