settings: Fix storage settings for (DEBUG and PIPELINE_ENABLED) case.
settings: Fix storage settings for (DEBUG and PIPELINE_ENABLED) case.

The documentation suggests that you can get the dev server to use
production assets by setting PIPELINE_ENABLED = True, but that
resulted in Django being unable to find any static files because
FileSystemFinder was missing from STATICFILES_FINDERS.  Using the
production storage configuration in this case reduces the number of
possible configurations and seems to result in things being less
broken.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

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