Remove donation functionality

...hku/quasseldroid/ui/clientsettings/about/AboutFragment.kt

app/src/main/res/layout/preferences_about_header.xml

.../main/res/layout/widget_advertisement_support_patreon.xml

app/src/main/res/values-de/strings.xml

app/src/main/res/values-it/strings.xml

app/src/main/res/values-lt/strings.xml

app/src/main/res/values-pt/strings.xml

app/src/main/res/values-sr/strings.xml

app/src/main/res/values/strings.xml

app/src/main/res/xml/preferences.xml