Crashlytics: Add consent preferences defaults

These should have been defined already, but now they're the safe
defaults that should spring the dialog on startup, and doesn't grant
consent by default.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Application/AppController.m

@@ -181,6 +181,8 @@ static AppController *kAppController = nil;
 #else
 	[[NSUserDefaults standardUserDefaults] registerDefaults:@{ @"NSApplicationCrashOnExceptions": @(YES) }];
 #endif
+	[[NSUserDefaults standardUserDefaults] registerDefaults:@{ @"crashlyticsConsented": @(NO),
+															   @"crashlyticsAskedConsent": @(NO) }];
 
 	[FIRApp configure];