Guillotine Fist SP Recovery Prevention Cleanup (#8443)

- Unified code for SC_EXTREMITYFIST
  * It stops natural SP recovery for 300s in pre-re
  * It stops natural SP recovery and recovery from items for 3s and shows icon in renewal
- Removed SC_EXTREMITYFIST2 as it's no longer needed
- Fixed an issue that caused a natural SP regen tick to happen right after using Guillotine Fist
- Fixes #8377

src/map/script.cpp

@@ -6073,7 +6073,7 @@ BUILDIN_FUNC(percentheal)
 		return SCRIPT_CMD_SUCCESS;
 
 #ifdef RENEWAL
-	if( sd->sc.getSCE(SC_EXTREMITYFIST2) )
+	if( sd->sc.getSCE(SC_EXTREMITYFIST) )
 		sp = 0;
 #endif