fix #16474 unittest.check type1 is type2 gives CT error (#16476)

* fix #16474
* more tests

tests/stdlib/tunittestpass.nim

@@ -0,0 +1,19 @@
+discard """
+  targets: "c js"
+"""
+
+
+import unittest
+
+block:
+  check (type(1.0)) is float
+  check type(1.0) is float
+  check (typeof(1)) isnot float
+  check typeof(1) isnot float
+
+  check 1.0 is float
+  check 1 isnot float
+
+  type T = type(0.1)
+  check T is float
+  check T isnot int