[ATL-2026] Use different logo for Edge Delta

Edge Delta appears to have two different logos going and choosing the
one they want to see on the site.

Author: ghoneycutt

data/events/2026/atlanta/main.yml

@@ -115,7 +115,7 @@ sponsors:
     level: gold
   - id: pulumi
     level: gold
-  - id: edge-delta
+  - id: edgedelta
     level: gold
   - id: ibm
     level: gold