test/tmt: Don't run bootloader-none test for composefs

Bootloader set to none is not supported with the composefs backend so we
skip this test for composefs backend

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

tmt/plans/integration.fmf

@@ -232,6 +232,7 @@ execute:
     how: fmf
     test:
       - /tmt/tests/tests/test-38-install-bootloader-none
+  extra-fixme_skip_if_composefs: true
 
 /plan-39-upgrade-tag:
   summary: Test bootc upgrade --tag functionality with containers-storage

tmt/tests/booted/test-install-bootloader-none.nu

@@ -2,7 +2,9 @@
 # tmt:
 #   summary: Test bootc install with --bootloader=none
 #   duration: 30m
-#
+# extra:
+#   fixme_skip_if_composefs: true
+
 use std assert
 use tap.nu