css: Fix size of GitLab icon in login and signup buttons.
css: Fix size of GitLab icon in login and signup buttons.

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