KT-18538 Fix inspection to detect unnecessary grand-base class qualifier

- Add separate option to enable/disable this inspection, as it is not
obvious if it should be always enabled or not
  - This option can be used to detect all unnecessary qualifiers in
  tests
- Add possibility to configure inspections via `settings.xml` in the
`AbstractMultiFileLocalInspectionTest.kt`
- ^KT-18538 Fixed

idea/idea-completion/src/org/jetbrains/kotlin/idea/completion/BasicLookupElementFactory.kt

@@ -52,8 +52,12 @@ class BasicLookupElementFactory(
         includeClassTypeArguments: Boolean = true,
         parametersAndTypeGrayed: Boolean = false
     ): LookupElement {
-        val _descriptor = descriptor.unwrapIfFakeOverride()
-        return createLookupElementUnwrappedDescriptor(_descriptor, qualifyNestedClasses, includeClassTypeArguments, parametersAndTypeGrayed)
+        return createLookupElementUnwrappedDescriptor(
+            descriptor.unwrapIfFakeOverride(),
+            qualifyNestedClasses,
+            includeClassTypeArguments,
+            parametersAndTypeGrayed
+        )
     }
 
     fun createLookupElementForJavaClass(