Remove unneeded check from getTransformationBody

Remove unneeded `argName` check, because it always evaluates to `true` (the `false` case is handled just before the modified line)

Author: Loghorn

src/services/codefixes/convertToAsyncFunction.ts

@@ -410,7 +410,7 @@ namespace ts.codefix {
                     break;
                 }
 
-                const synthCall = createCall(getSynthesizedDeepClone(func as Identifier), /*typeArguments*/ undefined, argName ? [argName.identifier] : emptyArray);
+                const synthCall = createCall(getSynthesizedDeepClone(func as Identifier), /*typeArguments*/ undefined, [argName.identifier]);
                 if (shouldReturn) {
                     return [createReturn(synthCall)];
                 }