Hide Purpose's own "Copy to Clipboard" function

This was added recently to Purpose, and it's not too useful for us.
We already have a bunch of better, more integrated ways to copy
events to the clipboard.

src/app/qml/ShareAction.qml

@@ -45,6 +45,8 @@ Kirigami.Action {
         model: Purpose.PurposeAlternativesModel {
             pluginType: "Export"
             inputData: root.inputData
+            // We already have many better ways to copy events to the clipboard
+            disabledPlugins: ["clipboardplugin"]
         }
 
         delegate: Kirigami.Action {