Remember all capabilities given to a widget

Fixes https://github.com/vector-im/element-web/issues/18786

Instead of replacing the remembered set, we now add to it. This should be safe as the user expectation was previously to remember the capabilities, so we can keep appending to that list.

This commit also moves the utility functions closer to the widget driver as they aren't needed in the dialog anymore.

src/components/views/dialogs/WidgetCapabilitiesPromptDialog.tsx

@@ -31,14 +31,6 @@ import LabelledToggleSwitch from "../elements/LabelledToggleSwitch";
 import { CapabilityText } from "../../../widgets/CapabilityText";
 import { replaceableComponent } from "../../../utils/replaceableComponent";
 
-export function getRememberedCapabilitiesForWidget(widget: Widget): Capability[] {
-    return JSON.parse(localStorage.getItem(`widget_${widget.id}_approved_caps`) || "[]");
-}
-
-function setRememberedCapabilitiesForWidget(widget: Widget, caps: Capability[]) {
-    localStorage.setItem(`widget_${widget.id}_approved_caps`, JSON.stringify(caps));
-}
-
 interface IProps extends IDialogProps {
     requestedCapabilities: Set<Capability>;
     widget: Widget;
@@ -95,10 +87,7 @@ export default class WidgetCapabilitiesPromptDialog extends React.PureComponent<
     };
 
     private closeAndTryRemember(approved: Capability[]) {
-        if (this.state.rememberSelection) {
-            setRememberedCapabilitiesForWidget(this.props.widget, approved);
-        }
-        this.props.onFinished({ approved });
+        this.props.onFinished({ approved, remember: this.state.rememberSelection });
     }
 
     public render() {