User input forced to lowercase when typing into the reference genome search

[innovate-invent]

The code that filters the reference list writes to the user input variable when changing to lowercase. It needs to make a copy beforehand.

https://github.com/brinkmanlab/galaxy-client/blob/f9d493674cdb7e11987b0baebbd0b56860702303/src/genomes/ReferenceGenomes.vue#L125

filter.toLower() needs to be moved to filterFunc()