Do not add extra 'this' parameter for TImpl's accessor

Fixes weird cases like super-call from a closure inside a trait with a required
class

compiler/testData/codegen/traits/withRequiredSuper.kt

@@ -0,0 +1,16 @@
+open class Base {
+    open fun foo() { }
+}
+
+trait Derived : Base {
+    override fun foo() {
+        super.foo()
+    }
+}
+
+class DerivedImpl : Derived, Base()
+
+fun box(): String {
+    DerivedImpl().foo()
+    return "OK"
+}

compiler/testData/codegen/traits/withRequiredSuperViaBridge.kt

@@ -0,0 +1,20 @@
+open class Base {
+    open fun foo() { }
+}
+
+trait Derived : Base {
+    override fun foo() {
+        object {
+            fun bar() {
+                super<Base>@Derived.foo()
+            }
+        }.bar()
+    }
+}
+
+class DerivedImpl : Derived, Base()
+
+fun box(): String {
+    DerivedImpl().foo()
+    return "OK"
+}