Pass config file path when reloading pihole-FTL.conf

[yubiuser]

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What does this PR aim to accomplish?:

Fixes #1783

PR #2130 added the flag force to the piholeFTLConfig function that forces the page to re-read the config file on reload if true was passed. This fixed #1783 already.
However, #2126 added a second argument (the config file path) without passing two arguments to piholeFTLConfig. So the forced reload was never happening, which re-introduced #1783.

This PR solves this by simply passing the default config file path to piholeFTLConfig

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-16-web-v5-13-and-core-v5-11-1-released/56384/1