ROUT tool contains detect IE script that can be refined or removed

[anselmbradford]

We don't run JS scripts in IE, but the rout tool has a detect IE script here https://github.com/cfpb/consumerfinance.gov/blob/main/cfgov/unprocessed/apps/rural-or-underserved-tool/js/common.js#L349

consumerfinance.gov/cfgov/unprocessed/apps/rural-or-underserved-tool/js/common.js

Line 359 in 6d28be4

function detectIE() {

That should be checked for what cases it actually runs in. It includes Edge, so presumably runs in those cases.