remove use of thunk action in ble and hub

This is a step towards moving these to sagas

src/components/BluetoothButton.tsx

@@ -2,9 +2,8 @@
 // Copyright (c) 2020 The Pybricks Authors
 
 import { connect } from 'react-redux';
-import { AnyAction } from 'redux';
-import { ThunkDispatch } from 'redux-thunk';
-import { connect as bleConnect, disconnect as bleDisconnect } from '../actions/ble';
+import { Action, Dispatch } from '../actions';
+import { toggleBluetooth } from '../actions/ble';
 import { RootState } from '../reducers';
 import { BLEConnectionState } from '../reducers/ble';
 import { BootloaderConnectionState } from '../reducers/bootloader';
@@ -12,11 +11,8 @@ import ActionButton, { ActionButtonProps } from './ActionButton';
 import btConnectedIcon from './images/bt-connected.svg';
 import btDisconnectedIcon from './images/bt-disconnected.svg';
 
-type Dispatch = ThunkDispatch<{}, {}, AnyAction>;
-
-type ButtonProps = ActionButtonProps<string>;
-type StateProps = Pick<ButtonProps, 'tooltip' | 'icon' | 'context' | 'enabled'>;
-type DispatchProps = Pick<ButtonProps, 'onAction'>;
+type StateProps = Pick<ActionButtonProps, 'tooltip' | 'icon' | 'enabled'>;
+type DispatchProps = Pick<ActionButtonProps, 'onAction'>;
 
 const mapStateToProps = (state: RootState): StateProps => {
     if (
@@ -26,27 +22,19 @@ const mapStateToProps = (state: RootState): StateProps => {
         return {
             tooltip: 'Connect using Bluetooth',
             icon: btDisconnectedIcon,
-            context: 'connect',
             enabled: true,
         };
     } else {
         return {
             tooltip: 'Disconnect Bluetooth',
             icon: btConnectedIcon,
-            context: 'disconnect',
             enabled: state.ble.connection === BLEConnectionState.Connected,
         };
     }
 };
 
 const mapDispatchToProps = (dispatch: Dispatch): DispatchProps => ({
-    onAction: (c): void => {
-        if (c === 'connect') {
-            dispatch(bleConnect());
-        } else {
-            dispatch(bleDisconnect());
-        }
-    },
+    onAction: (): Action => dispatch(toggleBluetooth()),
 });
 
 export default connect(mapStateToProps, mapDispatchToProps)(ActionButton);