circleci: Remove Codecov workaround.
circleci: Remove Codecov workaround.

Codecov has released the new version which fixes the find error.

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