fix(deep-link): handler not set as default on linux #2844
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the usage of xdg-mime was incorrect, we have to pass the full mime type including the
x-scheme-handler/
part to properly set the generated .desktop as the default handler for the protocol. this PR simply addresses that.i have tested this by checking with Kesomannen/gale using
xdg-mime query default
to check that it previously did not set the default correctly and that with this change it does.also fixes an issue that can occur if a tauri app using the plugin were to call the deep link register function more than once: it would continue to append to the existing .desktop file with the MimeType even if it was already in the existing .desktop file meaning you would end up with a huge MimeType section with as many duplicate entries as times the function has ever been called.