chore(emails): remove emoji from member invite email (#101175)

Small touchup on the copy:
<img width="706" height="628" alt="Screenshot 2025-10-08 at 10 56 53 AM"
src="https://github.com/user-attachments/assets/bc82698b-04ca-4677-bd10-59ba54c0e3d7"
/>

Author: cvxluo

src/sentry/templates/sentry/emails/member-invite.html

@@ -10,7 +10,7 @@
     <p>Looks like they need your help. You've been invited to join them:</p>
 
 
-<p>👉 <a href="{{ url }}" class="btn">Accept your invite</a></p>
+    <p><a href="{{ url }}" class="btn">Accept your invite</a></p>
 
     <div class="notice">Heads up: this invite link is just for you. Don't share it unless you want random strangers fixing your bugs.</div>