Use 'default' as base class in ClojureScript

The Lifecycle protocol is extended to java.lang.Object in Clojure, which
makes it possible to use any type of object as a component, although
only maps and records can receive dependencies.

When Component was ported to ClojureScript, `object` was used as the
base class, but some entities in ClojureScript are not sub-types of
`object`, as reported by goog.typeOf. For example, functions have the
type `function`. This prevents non-object types from being used as
components.

See also:

[extend-type]: https://github.com/clojure/clojurescript/blob/cb3e8c295ad5ed1961e7db1d0b19674eb7f71a5c/src/main/clojure/cljs/core.cljc#L1544
[defprotocol]: https://github.com/clojure/clojurescript/blob/cb3e8c295ad5ed1961e7db1d0b19674eb7f71a5c/src/main/clojure/cljs/core.cljc#L1961
[native-satisfies?]: https://github.com/clojure/clojurescript/blob/cb3e8c295ad5ed1961e7db1d0b19674eb7f71a5c/src/main/cljs/cljs/core.cljs#L247
[goog.typeOf]: https://google.github.io/closure-library/api/goog.html#typeOf

src/com/stuartsierra/component.cljc

@@ -14,7 +14,7 @@
 
 ;; No-op implementation if one is not defined.
 (extend-protocol Lifecycle
-  #?(:clj java.lang.Object :cljs object)
+  #?(:clj java.lang.Object :cljs default)
   (start [this]
     this)
   (stop [this]