[FIX] mail: fix emoji picker xml

Before this commit, a `t` opening and closing tag mismatched.
This would lead to an error when exporting the discuss app
translations.

```
Traceback (most recent call last):
  File "/home/odoo/Desktop/odoo/odoo/odoo/tools/translate.py", line 1152, in _babel_extract_terms
    for extracted in extract.extract(extract_method, src_file, keywords=extract_keywords, options=options):
  File "/home/odoo/.local/lib/python3.8/site-packages/babel/messages/extract.py", line 322, in extract
    results = func(fileobj, keywords.keys(), comment_tags,
  File "/home/odoo/Desktop/odoo/odoo/odoo/tools/translate.py", line 905, in babel_extract_qweb
    tree = etree.parse(fileobj)
  File "src/lxml/etree.pyx", line 3521, in lxml.etree.parse
  File "src/lxml/parser.pxi", line 1880, in lxml.etree._parseDocument
  File "src/lxml/parser.pxi", line 1900, in lxml.etree._parseFilelikeDocument
  File "src/lxml/parser.pxi", line 1795, in lxml.etree._parseDocFromFilelike
  File "src/lxml/parser.pxi", line 1201, in lxml.etree._BaseParser._parseDocFromFilelike
  File "src/lxml/parser.pxi", line 615, in lxml.etree._ParserContext._handleParseResultDoc
  File "src/lxml/parser.pxi", line 725, in lxml.etree._handleParseResult
  File "src/lxml/parser.pxi", line 654, in lxml.etree._raiseParseError
  File "/home/odoo/Desktop/odoo/odoo/addons/mail/static/src/emoji_picker/emoji_picker.xml", line 60
lxml.etree.XMLSyntaxError: Opening and ending tag mismatch: t line 10 and div, line 60, column 15

```

closes odoo/odoo#124751

X-original-commit: eb59c0157cbe2d5d82356333b0e35a5f9513524d
Signed-off-by: Louis Wicket (wil) <wil@odoo.com>

addons/mail/static/src/core/common/emoji_picker.xml

@@ -57,8 +57,8 @@
                     <t t-set="itemIndex" t-value="itemIndex + 1"/>
                 </t>
             </div>
-        </div>
-    </t>
+        </t>
+    </div>
 </t>
 
 <t t-name="mail.EmojiPicker.tab" owl="1">