static/js: Fix custom numeric emojis not working in reactions.
static/js: Fix custom numeric emojis not working in reactions.

Changes .data() Jquery methods to .attr() to prevent unnecessary data
type conversions of the emoji name.

Tested the fix manually and verified the test-js-with-node test suite.

Fixes: #14377

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