fix(hooks): incorrect found count/skipped output in mixed exec/non-exec batches

[joshtrichards]

The found variable is incorrectly decremented for non-executable scripts, which leads to misleading output when a hook folder contains an executable + a non-executable script (output will indicate the folder was fully scripted).

Place two scripts in before-starting hook folder: scriptA.sh and scriptB.sh.
Make sure scriptA.sh is properly executable.
Make sure scriptB.sh is not executable.

before:

=> Searching for hook scripts (*.sh) to run, located in the folder "/docker-entrypoint-hooks.d/before-starting"
==> Running the script (cwd: /var/www/html): "/docker-entrypoint-hooks.d/before-starting/scriptA.sh"
hello from scriptA.sh
==> Finished executing the script: "/docker-entrypoint-hooks.d/before-starting/scriptA.sh"
==> The script "/docker-entrypoint-hooks.d/before-starting/scriptB.sh was skipped, because it lacks the executable flag
==> Skipped: the "before-starting" folder does not contain any valid scripts

^^^last line

after:

=> Searching for hook scripts (*.sh) to run, located in the folder "/docker-entrypoint-hooks.d/before-starting"
==> Running the script (cwd: /var/www/html): "/docker-entrypoint-hooks.d/before-starting/scriptA.sh.sh"
hello from scriptA.sh
==> Finished executing the script: "/docker-entrypoint-hooks.d/before-starting/scriptA.sh"
==> The script "/docker-entrypoint-hooks.d/before-starting/scriptB.sh" was skipped, because it lacks the executable flag
=> Completed executing scripts in the "before-starting" folder