Update OAuth URL in .env to use full server address (#2861)

Author: CollinBeczak

.env

@@ -22,7 +22,7 @@ REACT_APP_DEFAULT_LOCALE='en-US'
 REACT_APP_MAP_ROULETTE_SERVER_URL='http://127.0.0.1:9000'
 REACT_APP_MAP_ROULETTE_SERVER_WEBSOCKET_URL='ws://127.0.0.1:9000/ws'
 REACT_APP_MAP_ROULETTE_SERVER_GRAPHQL_URL='http://127.0.0.1:9000/graphql'
-REACT_APP_SERVER_OAUTH_URL='/auth/authenticate?redirect=/mr3'
+REACT_APP_SERVER_OAUTH_URL='http://127.0.0.1:9000/auth/authenticate?redirect=/mr3'
 
 # OSM Server
 REACT_APP_OSM_SERVER='https://www.openstreetmap.org'