Fix style of new kokkos easyblock

Author: Thyre

easybuild/easyblocks/k/kokkos.py

@@ -31,7 +31,7 @@
 
 import easybuild.tools.toolchain as toolchain
 from easybuild.base import fancylogger
-from easybuild.framework.easyconfig import CUSTOM, MANDATORY
+from easybuild.framework.easyconfig import CUSTOM
 from easybuild.tools.build_log import EasyBuildError, print_warning
 from easybuild.tools.config import build_option
 from easybuild.tools.modules import get_software_root
@@ -319,4 +319,4 @@ def configure_step(self, srcdir=None, builddir=None):
         # Enable bindings for tuning tools
         self.cfg.update('configopts', '-DKokkos_ENABLE_TUNING=ON')
 
-        return super().configure_step(srcdir, builddir)
+        return super().configure_step(srcdir, builddir)