Add pointer hover effects to compose poll buttons

Tusker/Screens/Compose/ComposePollView.swift

@@ -46,6 +46,7 @@ struct ComposePollView: View {
                 }
                 .accentColor(buttonForegroundColor)
                 .background(Circle().foregroundColor(buttonBackgroundColor))
+                .hoverEffect()
             }
             
             ForEach(Array(poll.options.enumerated()), id: \.element.id) { (e) in
@@ -161,6 +162,7 @@ struct ComposePollOption: View {
             }
             .foregroundColor(poll.options.count == 1 ? .gray : .red)
             .disabled(poll.options.count == 1)
+            .hoverEffect()
         }
     }