IR: copy context receiver parameters count in FakeOverrideCopier

#KT-63430 Fixed

compiler/testData/codegen/box/extensionFunctions/contextReceivers/kt63430.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +ContextReceivers
+// TARGET_BACKEND: JVM_IR
+// WITH_STDLIB
+
+abstract class A {
+    context(C)
+    fun P.foo(): String = result
+}
+
+class B : A() {
+    val p = P()
+
+    context(C)
+    fun test(): String =
+        p.run {
+            foo()
+        }
+}
+
+class P
+class C(val result: String)
+
+fun box(): String =
+    with(C("OK")) {
+        B().test()
+    }