Revert "mycli: disable checking to fix build"

This reverts commit f12c5fd4b8.
The tests were broken because paramiko couldn't be imported, which was
fixed by 50d865aa19.

pkgs/tools/admin/mycli/default.nix

@@ -38,9 +38,6 @@ buildPythonApplication rec {
     export LC_ALL="en_US.UTF-8"
   '';
 
-  # fails at checkphase due to the below test paths
-  # disabling it specifically does not work, so we disable checking altogether
-  doCheck = false;
   disabledTestPaths = [
     "mycli/packages/paramiko_stub/__init__.py"
   ];