python: Remove unnecessary list comprehension.
python: Remove unnecessary list comprehension.

`all` can take a generator, not just a list.  

Using a generator expression here is simpler and faster.


andersk/zulip,zulip/zulip,rht/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,zulip/zulip,andersk/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,rht/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip