v1.0.44: clear tracked running state immediately after stopping old timer

Found while testing v1.0.43's icon self-heal: when switching from one
running timer to another, the old Notion entry was stopped but
memRunningActionId/EntryId weren't cleared until AFTER the new
startTimer call resolved. During that gap, a blocked press on the
just-stopped button read the stale (not-yet-cleared) tracked id and
self-healed itself back to a wrongly-'running' green — reinforcing
the exact staleness the self-heal was meant to fix. Now cleared to
null the moment the old timer is actually stopped.

com.pdma.notion-timer.sdPlugin/bin/plugin.js.sig

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