emoji-settings: Fix value of aria-label attribute of search input.
emoji-settings: Fix value of aria-label attribute of search input.

This commit changes the value of aria-label attribute of search
input of emoji settings form to be "Filter emojis" instead of
"Filter linkifiers".

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