ui: tell ESLint to be strict in check target

the .lint-incremental target, which is implicitly used by the install
target, is still more forgiving to allow faster "change, build, test"
iteration when developing.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/control

@@ -79,7 +79,7 @@ Build-Depends: debhelper (>= 11),
  uuid-dev,
  debhelper (>= 12~),
  bash-completion,
- pve-eslint,
+ pve-eslint (>= 7.12.1-1),
  python3-docutils,
  python3-pygments,
  rsync,