chore(storybook): remove unused utils

storybook/src/Storybook/StorybookUtils.qml

@@ -2,26 +2,6 @@ pragma Singleton
 import QtQml 2.14
 
 QtObject {
-    function singleShotConnection(prop, handler) {
-        const internalHandler = (...args) => {
-            handler(...args)
-            prop.disconnect(internalHandler)
-        }
-        prop.connect(internalHandler)
-    }
-
-    function getUniqueValuesFromModel(model, prop) {
-        if (!model)
-            return []
-
-        const values = []
-        for (let i = 0; i < model.count; i++)
-            values.push(model.get(i)[prop])
-
-        const onlyUnique = (value, index, self) => self.indexOf(value) === index
-        return values.filter(onlyUnique)
-    }
-
     function formatQmlCode(code) {
         code = code.replace(/^\n+/, "")
         code = code.replace(/\s+$/, "")