[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inner/modality.fir.kt

@@ -0,0 +1,17 @@
+class Outer {
+    open class OpenNested
+    class FinalNested
+    
+    open inner class OpenInner
+    class FinalInner
+
+    class Nested1 : OpenNested()
+    class Nested2 : FinalNested()
+    class Nested3 : OpenInner()
+    class Nested4 : FinalInner()
+
+    inner class Inner1 : OpenNested()
+    inner class Inner2 : FinalNested()
+    inner class Inner3 : OpenInner()
+    inner class Inner4 : FinalInner()
+}