[UI] Update donation button icon on event home (#12375)

## Summary of the problem
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closes #12374


## Describe your changes
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Author: Luke-Oldenburg

app/views/events/_donate_button.html.erb

@@ -2,7 +2,7 @@
 
 <% if event.donation_page_available? && event.is_public && !organizer_signed_in? %>
   <%= link_to start_donation_donations_path(event), target: "_blank", class: "btn bg-blue flex items-center" do %>
-    <%= inline_icon "purse" %>
+    <%= inline_icon "support" %>
     Donate
   <% end %>
 <% end %>