Add one more test for KT-61959

Generate FE tests

compiler/testData/diagnostics/tests/typeParameters/outerTypeParameterAsSupertype.kt

@@ -0,0 +1,18 @@
+// FIR_IDENTICAL
+
+package test
+
+interface OuterParam
+
+class A: OuterParam
+
+class Outer<OuterParam> {
+
+    class Nested: OuterParam {
+        fun foo(): OuterParam = A()
+    }
+}
+
+fun main() {
+    val c: OuterParam = Outer.Nested().foo()
+}