tests/basics/namedtuple*: Import ucollections first.

Otherwise, test may have artefacts in the presence of the micropython-lib
module.

tests/basics/namedtuple1.py

@@ -1,8 +1,8 @@
 try:
     try:
-        from collections import namedtuple
-    except ImportError:
         from ucollections import namedtuple
+    except ImportError:
+        from collections import namedtuple
 except ImportError:
     print("SKIP")
     raise SystemExit

tests/basics/namedtuple_asdict.py

@@ -1,8 +1,8 @@
 try:
     try:
-        from collections import namedtuple
-    except ImportError:
         from ucollections import namedtuple
+    except ImportError:
+        from collections import namedtuple
 except ImportError:
     print("SKIP")
     raise SystemExit