tests: drop py36 conditionals in test-hook.t

Since this is a `>=` test, it's really conditionalizing py27 content, which
isn't a thing anymore.

tests/test-hook.t

@@ -985,13 +985,11 b' test python hooks'
   Traceback (most recent call last):
   SyntaxError: * (glob)
   Traceback (most recent call last):
-  ImportError: No module named 'hgext_syntaxerror' (no-py36 !)
-  ModuleNotFoundError: No module named 'hgext_syntaxerror' (py36 !)
+  ModuleNotFoundError: No module named 'hgext_syntaxerror'
   Traceback (most recent call last):
   SyntaxError: * (glob)
   Traceback (most recent call last):
-  ImportError: No module named 'hgext_syntaxerror' (no-py36 !)
-  ModuleNotFoundError: No module named 'hgext_syntaxerror' (py36 !)
+  ModuleNotFoundError: No module named 'hgext_syntaxerror'
   Traceback (most recent call last):
       raise error.HookLoadError( (py38 !)
   mercurial.error.HookLoadError: preoutgoing.syntaxerror hook is invalid: import of "syntaxerror" failed
@@ -1147,21 +1145,16 b' make sure --traceback works on hook impo'
   $ hg --traceback commit -ma 2>&1 | egrep '^exception|ImportError|ModuleNotFoundError|Traceback|HookLoadError|abort'
   exception from first failed import attempt:
   Traceback (most recent call last):
-  ImportError: No module named 'somebogusmodule' (no-py36 !)
-  ModuleNotFoundError: No module named 'somebogusmodule' (py36 !)
+  ModuleNotFoundError: No module named 'somebogusmodule'
   exception from second failed import attempt:
   Traceback (most recent call last):
-  ImportError: No module named 'somebogusmodule' (no-py36 !)
-  ModuleNotFoundError: No module named 'somebogusmodule' (py36 !)
+  ModuleNotFoundError: No module named 'somebogusmodule'
   Traceback (most recent call last):
-  ImportError: No module named 'hgext_importfail' (no-py36 !)
-  ModuleNotFoundError: No module named 'hgext_importfail' (py36 !)
+  ModuleNotFoundError: No module named 'hgext_importfail'
   Traceback (most recent call last):
-  ImportError: No module named 'somebogusmodule' (no-py36 !)
-  ModuleNotFoundError: No module named 'somebogusmodule' (py36 !)
+  ModuleNotFoundError: No module named 'somebogusmodule'
   Traceback (most recent call last):
-  ImportError: No module named 'hgext_importfail' (no-py36 !)
-  ModuleNotFoundError: No module named 'hgext_importfail' (py36 !)
+  ModuleNotFoundError: No module named 'hgext_importfail'
   Traceback (most recent call last):
       raise error.HookLoadError( (py38 !)
   mercurial.error.HookLoadError: precommit.importfail hook is invalid: import of "importfail" failed