Rearrange DMAPI instructions to flow better

src/DMAPI/tgs.dm

@@ -7,13 +7,13 @@
 //create this define if you want to do configuration outside of this file
 #ifndef TGS_EXTERNAL_CONFIGURATION
 
+//Comment this out once you've filled in the below
+#error TGS API unconfigured
+
 //Uncomment this if you wish to allow the game to interact with TGS 3
 //This will raise the minimum required security level of your game to TGS_SECURITY_TRUSTED due to it utilizing call()()
 //#define TGS_V3_API
 
-//Comment this out once you've filled in the below
-#error TGS API unconfigured
-
 //Required interfaces (fill in with your codebase equivalent):
 
 //create a global variable named `Name` and set it to `Value`