Beta Branch fix 4 dmotd / check-for-updates bugs in 140.00beta01

fix 4 dmotd / check-for-updates bugs in 140.00beta01

Bundle of four small but real bug fixes verified by multi-AI consult
against dmotd.sh and the parallel check-for-updates.sh.

7a — Pushover centminmod-update title was missing the branch name.
The bare $branchname at dmotd.sh:741 is unset in the dmotd shell
environment (branchname is defined in centmin.sh:30 but never
sourced into dmotd's env). Replace with ${_local_branch:-unknown},
the value already computed at dmotd.sh:716 via git rev-parse.

7b — Outdated-branch allowlist at dmotd.sh:275 was missing
140.00beta01, so users one major release behind got no "newer
branch available" nudge. The warning text already offers both
"132.00stable or 141.00beta01" as upgrade targets, covering both
EL7-9 (stable) and EL10 (current beta) paths.

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7c — dos2unix calls on custom_config.inc were unguarded — the
pushover.ini variant immediately below correctly guards with
[ -f /usr/bin/dos2unix ]. Hosts missing dos2unix would print a
"command not found" error on every dmotd-triggered login (and
every tools/check-for-updates.sh run). Added the existence check
to match the safer pattern in both files.

7d — DMOTD_PHPCHECK_DEBUG branch in get_latest_php_version()
assigned TEST_PHPVERS but the unconditional echo "$LATEST_PHPVERS"
below always read LATEST_PHPVERS — so debug mode silently broke
PHP update detection. Also, the trailing | tee captured nothing
useful: bash -x writes its trace to stderr, the pipe reads
stdout. Fixed both: assign to LATEST_PHPVERS, redirect bash -x
stderr (2>) directly to the debug log file. Applies to both
config/motd/dmotd.sh and tools/check-for-updates.sh.

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140.00beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/140.00beta01
• Commit History: https://github.com/centminmod/centminmod/commits/140.00beta01