import: Fix processing_avatars bug in 'import_uploads_s3'.
import: Fix processing_avatars bug in 'import_uploads_s3'.

All the avatars should be processed later on to run the
'ensure_medium_avatar_image' function. This is similar to
'import_uploads_local'.

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