Make it clear selection box also includes incremental string search (e.g. Variables in Immunomodulator Module)

[vthorsson]

Should be mentioned in a text description that drop-down selection boxes also include search, in cases where it is helpful. For example Gene selection in Immunomodulator module Options include

• changing title of drop-down "Select or Search for Variable" instead of "Select Variable"
• including in the text descriptions

[andrewelamb]

@vthorsson please checkout https://github.com/CRI-iAtlas/shiny-iatlas/tree/fix/#163

This was accidentally commited with the fix to issue #163

I relabeled all the select buttons where searching might be useful(ie. more choices than can appear in the dropdown)

[vthorsson]

OK, thanks @andrewelamb. Is the the new version currently in develop (I am looking at the Immunomodulator module "select variable" as an example )

[vthorsson]

@andrewelamb , now looking in fix/#163and see new label "Select or Search for Variable" for the immunomodulator module . Looks good.