stream_edit: Use preventDefault and stopPropagation.
stream_edit: Use preventDefault and stopPropagation.

We should be using these patterns consistently in our click handlers.

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