backends: Fix unnecessary duplicate query to realm in social auth.
backends: Fix unnecessary duplicate query to realm in social auth.

This is just a small cleanup to the social auth backend code.

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