configure the dev keycloak realm to use a local mailer

The previous value was invalid, and not in use anyway. This way, when keycloak
send an email, it could be received and displayed the the user. Tiltronic is
adding this functionality.

charts/keycloak/dev-realm.json

@@ -1515,13 +1515,10 @@
     "strictTransportSecurity" : "max-age=31536000; includeSubDomains"
   },
   "smtpServer" : {
-    "password" : "123456",
-    "auth" : "true",
-    "host" : "email-smtp.us-west-2.amazonaws.com",
+    "host" : "smtp",
+    "port" : "25",
     "from" : "[email protected]",
-    "fromDisplayName" : "Tidepool",
-    "ssl" : "true",
-    "user" : "123456"
+    "fromDisplayName" : "Tidepool"
   },
   "loginTheme" : "tidepool",
   "emailTheme" : "tidepool",