[FIX] mail: emoji picker with only widely supported emojis
1. Remove emoji that have unicode version equal or greater than 13.0. 2. Also removes "smiling_face" and "frowning_face" emojis, as although they are old emojis, their visual support is quite lacking, so they feel off. As substition, use "slightly_smiling_face" and "slightly_frowning_face" respectively. 3. All regional flags have been removed. 4. the 11 remaining flags have been moved to "Symbols" category. Task-2976577 closes odoo/odoo#99753 Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
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