FIR: Rework delegation constructor calls resolution

Make it work independently of being called for inner class (as in FE 1.0)

compiler/testData/diagnostics/tests/secondaryConstructors/kt6993.fir.kt

@@ -1,5 +1,5 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 // !WITH_NEW_INFERENCE
 class X<T>(val t: T) {
-    constructor(t: T, i: Int) : this(i)
-}
+    constructor(t: T, i: Int) : <!INAPPLICABLE_CANDIDATE!>this<!>(i)
+}