org settings: Refactor check_property_changed.
org settings: Refactor check_property_changed.

In this refactor property values are handled more carefully i.e.
we first check whether property_name refers to a property values
which we can't get from the input elements like we do have in org
permissions section for properties like realm_add_emoji_by_admins_only.

Small refactor in property_value_element_refers is to prevent many
return statements on further addition of property names.

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