Fix merging of wlan interfaces

[cyberqueenmeg]

Problem

• Current Yunohost hotspot automatically merges wlan interfaces with no way to undo it

Solution

• Gets rid of wlan merging

PR Status

• [x] Code finished and ready to be reviewed/tested
• [x] The fix/enhancement were manually tested (if applicable)

Automatic tests

Automatic tests can be triggered on https://ci-apps-dev.yunohost.org/ after creating the PR, by commenting "!testme", "!gogogadgetoci" or "By the power of systemd, I invoke The Great App CI to test this Pull Request!". (N.B. : for this to work you need to be a member of the Yunohost-Apps organization)

[alexAubin]

Fix already included in https://github.com/YunoHost-Apps/hotspot_ynh/pull/95