Fixed callable inspection for 'namedtuple' instances (PY-8801)

Don't cast reference type returned by a type provider to an instance
type. It should know better what type to return.

python/src/com/jetbrains/python/psi/impl/PyCallExpressionHelper.java

@@ -420,9 +420,6 @@ public class PyCallExpressionHelper {
           }
           final PyType providedType = PyReferenceExpressionImpl.getReferenceTypeFromProviders(target, context, call);
           if (providedType != null) {
-            if (providedType instanceof PyClassType) {
-              return ((PyClassType)providedType).toInstance();
-            }
             return providedType;
           }
           if (target instanceof Callable) {

python/testData/inspections/PyCallingNonCallableInspection/qualifiedNamedTuple.py

@@ -0,0 +1,4 @@
+import collections
+
+Point = collections.namedtuple('Point', 'x y')
+p1 = Point(1, 2)

python/testSrc/com/jetbrains/python/inspections/PyCallingNonCallableInspectionTest.java

@@ -69,6 +69,11 @@ public class PyCallingNonCallableInspectionTest extends PyTestCase {
     doTest();
   }
 
+  // PY-8801
+  public void testQualifiedNamedTuple() {
+    doTest();
+  }
+
   private void doTest() {
     setLanguageLevel(LanguageLevel.PYTHON27);
     try {