sysv init script - minor syntax 'bug' when setting default value for shell variable

As discussed in the notes to 08fa8798269e5df9e74227a1d78e35c21e11031c it should be

`KILL_ON_STOP_TIMEOUT=${KILL_ON_STOP_TIMEOUT:-0}`

(i.e. with the colon).

Issue as per request by @purbon

Locate the SysV init script and inspect the assignment for KILL_ON_STOP_TIMEOUT, using commit 08fa8798269e5df9e74227a1d78e35c21e11031c as context. Confirm the shell default-value syntax and run the relevant init-script checks, if present; done means the assignment includes the colon and remains valid shell syntax.

Written by the indexing model from the issue text.