Change the logo src to a relative path #15157

Currently the "Powered by Matomo" logo is using an absolute path. This becomes an issue when used in an intranet and internet as the domain could be an ip address.

Change:

<img src="https://example.innocraft.cloud/plugins/Morpheus/images/logo.svg?matomo" tabindex="3" alt="Matomo" class="default-piwik-logo">

to

<img src="/plugins/Morpheus/images/logo.svg?matomo" tabindex="3" alt="Matomo" class="default-piwik-logo">

using an absolute path might make problems when Matomo is installed in a subdirectory