Fix icon key name in "View YAML" modal (#34140)

Fixes #34060.

- [x] QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

- [x] Confirmed that the fix is not expected to adversely impact load
test results

frontend/pages/SoftwarePage/SoftwareTitleDetailsPage/ViewYamlModal/helpers.tsx

@@ -194,7 +194,7 @@ export const createPackageYaml = ({
   }
 
   if (iconUrl) {
-    yaml += `  icon_url:
+    yaml += `  icon:
     path: ./icons/${hyphenatedSWTitle}-icon.png
 `;
   }