Update toolbar.coffee
Missing import of logger.
Error is logged if event_type does not match and therefore a Reference error was raised because of the missing import.
import * as p from "core/properties"
import {any, sortBy} from "core/util/array"
+import {logger} from "core/logging"
import {ActionTool} from "./actions/action_tool"
import {HelpTool} from "./actions/help_tool"
