Search field, remove text when match is found

[oganm]

The search field behaves kind of weird. When you search for a gene e.g. pax6, and select pax6, the text I typed doesn’t disappear

[oganm]

Solution to this and #45 should b fairly similar and involve digging into either TomSelect documentation here or changing the selection plugin while retaining existing functionality.

Current way to create the selections involve a custom function defined here

The associated javascript is located here

https://github.com/oganm/TomSelectWidget is an attempt to have a shinywidget implementation of tomselect which would save us from injecting code into shiny