Add icon to SVG subset when emojis are off

Add icon to SVG subset when emojis are off

diff --git a/plugin.rb b/plugin.rb
index 8bec6a1..d7cc5cb 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -8,6 +8,8 @@ enabled_site_setting :staff_notes_enabled
 
 register_asset 'stylesheets/staff_notes.scss'
 
+register_svg_icon "sticky-note" if respond_to?(:register_svg_icon)
+
 STAFF_NOTE_COUNT_FIELD = "staff_notes_count"
 
 after_initialize do

GitHub sha: 73d6b9fc