settings_panel_menu: Remove leftover angry debugging assertions.
settings_panel_menu: Remove leftover angry debugging assertions.

Apparently I forgot to remove these from commit
0b4483c8d272d098a915393f2bd9cde12586afb0 (#15920).

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

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