Change connect button label based on app state

Author: murilopolese

ui/arduino/components/toolbar.js

@@ -1,7 +1,7 @@
 function Toolbar(state, emit) {
   const connect = Button({
     icon: state.isConnected ? 'icons/Connect.svg' : 'icons/Disconnect.svg',
-    label: 'Connect',
+    label: state.isConnected ? 'Disconnect' : 'Connect',
     disabled: false,
     onclick: () => emit('open-port-dialog'),
     color: 'default'