settings: Remove intentional waiting time in deactivate account request.
settings: Remove intentional waiting time in deactivate account request.

The waiting time of 5000ms was probably added for testing UI of
spinner in 2f99e6b7b2 and was missed in review. This commit removes
the waiting time and now the user is deactivated almost instantly when
the button is clicked.

zulip/zulip,eeshangarg/zulip,punchagan/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,rht/zulip,kou/zulip,zulip/zulip,rht/zulip,punchagan/zulip,kou/zulip,zulip/zulip,zulip/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,andersk/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,zulip/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,rht/zulip