Fix config panel field name: photographer.profileImage, not .image

Caught by testing against the real dev config after the initial
commit - the quick-edit form was writing to a nonexistent key instead
of the one the rest of the app actually reads.

src/dashboard.html

@@ -593,7 +593,7 @@ const CFG_QUICK_FIELDS = [
   ['cfg-site-tagline', 'site.tagline'],
   ['cfg-site-heroImage', 'site.heroImage'],
   ['cfg-photographer-name', 'photographer.name'],
-  ['cfg-photographer-image', 'photographer.image'],
+  ['cfg-photographer-image', 'photographer.profileImage'],
   ['cfg-photographer-bio', 'photographer.bio'],
   ['cfg-contact-email', 'contact.email'],
   ['cfg-contact-phone', 'contact.phone'],