FIR: Minor. Simplify FirInvokeResolveTowerExtension

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/tower/FirInvokeResolveTowerExtension.kt

@@ -136,13 +136,11 @@ internal class FirInvokeResolveTowerExtension(
     }
 
     private fun enqueueResolverTasksForInvokeReceiverCandidates(
-        extensionInvokeOnActualReceiver: Boolean,
+        invokeBuiltinExtensionMode: Boolean,
         info: CallInfo,
         receiverGroup: TowerGroup,
         collector: CandidateCollector
     ) {
-        val invokeBuiltinExtensionMode: Boolean = extensionInvokeOnActualReceiver
-
         for (invokeReceiverCandidate in collector.bestCandidates()) {
             val symbol = invokeReceiverCandidate.symbol
             if (symbol !is FirCallableSymbol<*> && symbol !is FirClassLikeSymbol<*>) continue
@@ -154,7 +152,6 @@ internal class FirInvokeResolveTowerExtension(
                 continue
             }
 
-
             val extensionReceiverExpression = invokeReceiverCandidate.extensionReceiverExpression()
             val useImplicitReceiverAsBuiltinInvokeArgument =
                 !invokeBuiltinExtensionMode && isExtensionFunctionType &&