add missing ELIF

Author: raydienull

formatter/constants.js

@@ -488,6 +488,7 @@ const ControlKeywords = [
   "FORPLAYERS",
   "IF",
   "ELSEIF",
+  "ELIF",
   "ELSE",
   "ENDIF",
   "WHILE",

formatter/scp.formatter.js

@@ -81,7 +81,7 @@ class SCPFormatter {
    * @returns {boolean} True if the keyword is a block middle
    */
   isBlockMiddle(keyword) {
-    return keyword === "ELSE" || keyword === "ELSEIF";
+    return keyword === "ELSE" || keyword === "ELSEIF" || keyword === "ELIF";
   }
 
   /**