Default whitelist array, not string.

Thanks to xet7 !

snap-src/bin/config

@@ -175,7 +175,7 @@ DEFAULT_OAUTH2_FULLNAME_MAP=""
 KEY_OAUTH2_FULLNAME_MAP="oauth2-fullname-map"
 
 DESCRIPTION_OAUTH2_ID_TOKEN_WHITELIST_FIELDS="OAuth2 ID Token Whitelist Fields. Example: []"
-DEFAULT_OAUTH2_ID_TOKEN_WHITELIST_FIELDS="[]"
+DEFAULT_OAUTH2_ID_TOKEN_WHITELIST_FIELDS=[]
 KEY_OAUTH2_ID_TOKEN_WHITELIST_FIELDS="oauth2-id-token-whitelist-fields"
 
 DESCRIPTION_OAUTH2_REQUEST_PERMISSIONS="OAuth2 Request Permissions. Example: 'openid profile email'"