sharding: Fix permissions on the nginx_sharding.conf file.
sharding: Fix permissions on the nginx_sharding.conf file.

The zulip user needs to be able to read the file, when running the
backup tool.
We put root:root as owner on other nginx config files, so it's probably
correct to keep the ownership as it is, and set the mode to 0644.

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