package/screen: rename patch with the proper naming convention

As reported by check-package (by calling it directly):
use name <number>-<description>.patch

Output of:
make screen-dirclean screen-patch | grep 'Patching\|Applying'

Before:
>>> screen 4.8.0 Patching
Applying 0001-no-memcpy-fallback.patch using patch:
Applying 0002-install-no-backup-binary.patch using patch:
Applying 0003-install-always-chmod.patch using patch:
Applying 0004-install-nonversioned-binary.patch using patch:
Applying 0005-rename-sched_h.patch using patch:
Applying 0006-comm-h-now-depends-on-term-h.patch using patch:
Applying 0007-comm.h-needed-for-list_-display-generic-.o.patch using patch:
Applying 0008_CVE-2021-26937.patch using patch:

After:
>>> screen 4.8.0 Patching
Applying 0001-no-memcpy-fallback.patch using patch:
Applying 0002-install-no-backup-binary.patch using patch:
Applying 0003-install-always-chmod.patch using patch:
Applying 0004-install-nonversioned-binary.patch using patch:
Applying 0005-rename-sched_h.patch using patch:
Applying 0006-comm-h-now-depends-on-term-h.patch using patch:
Applying 0007-comm.h-needed-for-list_-display-generic-.o.patch using patch:
Applying 0008-CVE-2021-26937.patch using patch:

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>