[Blockly] don't use a shadow block for oh_runrule parameters (#1260)

Reported in https://community.openhab.org/t/blockly-doesnt-like-the-value-in-key-value-pairs/131049 and other places.
This seems to be an issue with Blockly - shadow blocks with mutations don't work.

Signed-off-by: Yannick Schaus <github@schaus.net>

bundles/org.openhab.ui/web/src/pages/settings/rules/script/blockly-editor.vue

@@ -666,9 +666,9 @@
  </shadow>
  </value>
  <value name="parameters">
- <shadow type="dicts_create_with">
+ <block type="dicts_create_with">
  <mutation items="0" />
- </shadow>
+ </block>
  </value>
  </block>
  <sep gap="48" />