fix: selected_workspace is not defined

The var was added in PR #94, but generates an exception because is not defined.
Rolling back to int(key) to address this.

closes #95

Author: yuriploc

app.py

@@ -872,13 +872,13 @@ def unhandled_input(self, key):
                 return
 
             # Workspace is selected
-            if selected_workspace - 1 == self.workspaces_line.selected:
+            if int(key) - 1 == self.workspaces_line.selected:
                 return
+            self.workspaces_line.select(int(key))
 
-            self.workspaces_line.select(selected_workspace)
             # Stop rtm to switch workspace
             self.real_time_task.cancel()
-            return self.switch_to_workspace(selected_workspace)
+            return self.switch_to_workspace(int(key))
         elif key == keymap['set_snooze']:
             return self.open_set_snooze()