fix(MyLocation): user location functionality

[TheGreatRefrigerator]

the show my location functionality was broken, prob. due to dependency updates, the slot property was not working anymore.

It was changed to use templates, #activator and v-on as described in the vuetify 1.5 docs: https://v15.vuetifyjs.com/en/components/lists#examples

Minor style change to use "dropdown" menu instead of separate buttons.

[sonarcloud[bot]]

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