JVM_IR: remove an unnecessary hack from BridgeLowering

Correct IR is more important than whether some inaccessible members
precisely match what was generated by the old backend.

compiler/testData/codegen/bytecodeText/directInvoke/inplaceClosure.kt

@@ -3,4 +3,4 @@ fun test() {
     1.fn()
 }
 
-// 1 invoke \(I\)I
+// 1 invoke \(Ljava/lang/Object;\)Ljava/lang/Object;