Frontend: fixed explicit receiver kind for dynamic call with implicit dispatch receiver.

Additionally added tests for other cases.

compiler/testData/resolvedCalls/dynamic/hasBothDispatchAndExtensionReceivers.txt

@@ -0,0 +1,18 @@
+class A {
+    fun dynamic.foo() {}
+}
+
+fun bar(a: A, b: dynamic) {
+    with (a) {
+        b.<caret>foo()
+    }
+}
+
+
+Resolved call:
+
+Resulting descriptor: fun dynamic.foo(): Unit defined in A
+
+Explicit receiver kind = EXTENSION_RECEIVER
+Dispatch receiver = AExt{fun A.<anonymous>(): Unit defined in bar}
+Extension receiver = b {('Nothing'..'Any?')}