libobs: Rename "Mac OS X" to "macOS" in log

libobs/obs-cocoa.m

@@ -139,7 +139,7 @@ static void log_available_memory(void)
 static void log_os(void)
 {
 	NSProcessInfo *pi = [NSProcessInfo processInfo];
-	blog(LOG_INFO, "OS Name: Mac OS X");
+	blog(LOG_INFO, "OS Name: macOS");
 	blog(LOG_INFO, "OS Version: %s",
 	     [[pi operatingSystemVersionString] UTF8String]);
 }