login: Fix a useless query with DevAuthBackend.
login: Fix a useless query with DevAuthBackend.

This block was setting `realm` to a value that it already was if you
read a bit further up in the function.

punchagan/zulip,hackerkid/zulip,brainwane/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,punchagan/zulip,brainwane/zulip,kou/zulip,punchagan/zulip,punchagan/zulip,tommyip/zulip,showell/zulip,timabbott/zulip,showell/zulip,brainwane/zulip,rishig/zulip,zulip/zulip,andersk/zulip,rht/zulip,brainwane/zulip,eeshangarg/zulip,kou/zulip,brainwane/zulip,eeshangarg/zulip,shubhamdhama/zulip,rishig/zulip,punchagan/zulip,zulip/zulip,timabbott/zulip,shubhamdhama/zulip,zulip/zulip,rishig/zulip,tommyip/zulip,showell/zulip,shubhamdhama/zulip,shubhamdhama/zulip,tommyip/zulip,hackerkid/zulip,rishig/zulip,rishig/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,shubhamdhama/zulip,brainwane/zulip,tommyip/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,rishig/zulip,eeshangarg/zulip,tommyip/zulip,shubhamdhama/zulip,timabbott/zulip,zulip/zulip,rht/zulip,timabbott/zulip,kou/zulip,kou/zulip,hackerkid/zulip,rht/zulip,tommyip/zulip,tommyip/zulip,rishig/zulip,brainwane/zulip,hackerkid/zulip,synicalsyntax/zulip,timabbott/zulip,showell/zulip,rht/zulip,zulip/zulip,showell/zulip,shubhamdhama/zulip,showell/zulip,rht/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,showell/zulip,andersk/zulip,andersk/zulip,synicalsyntax/zulip,synicalsyntax/zulip,punchagan/zulip,synicalsyntax/zulip,punchagan/zulip,synicalsyntax/zulip,zulip/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,timabbott/zulip,eeshangarg/zulip,synicalsyntax/zulip