recentComments bug

If you call a domain objects "getRecentComments" method that this plugin injects, an exception is throw.
This patch fixes this method. Very small fix

java.lang.IllegalArgumentException: argument type mismatch
at CommentableGrailsPlugin$_closure2_closure4_closure5_closure11_closure12.doCall(CommentableGrailsPlugin.groovy:59)
at CommentableGrailsPlugin$_closure2_closure4_closure5_closure11_closure12.doCall(CommentableGrailsPlugin.groovy)
at grails.orm.HibernateCriteriaBuilder.invokeClosureNode(HibernateCriteriaBuilder.java:1233)
at grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:992)
at CommentableGrailsPlugin$_closure2_closure4_closure5_closure11.doCall(CommentableGrailsPlugin.groovy:57)
at georepo.services.MobileService.getSpotResponse(MobileService.groovy:198)
at georepo.services.MobileService$$FastClassByCGLIB$$7001860e.invoke(<generated>
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at georepo.services.MobileService$$EnhancerByCGLIB$$a63122cc.getSpotResponse(<generated>
at georepo.services.MobileService$getSpotResponse.call(Unknown Source)
at georepo.MobileServiceTests.testSpotWithComments(MobileServiceTests.groovy:68)
at junit.framework.Test$run.call(Unknown Source)
at _GrailsTest_groovy$_run_closure4.doCall(_GrailsTest_groovy:262)
at _GrailsTest_groovy$_run_closure4.call(_GrailsTest_groovy)
at _GrailsTest_groovy$_run_closure2.doCall(_GrailsTest_groovy:221)
at _GrailsTest_groovy$_run_closure1_closure21.doCall(_GrailsTest_groovy:181)
at _GrailsTest_groovy$_run_closure1.doCall(_GrailsTest_groovy:168)
at TestApp$_run_closure1.doCall(TestApp:102)
at gant.Gant$_dispatch_closure4.doCall(Gant.groovy:324)
at gant.Gant$_dispatch_closure6.doCall(Gant.groovy:334)
at gant.Gant$_dispatch_closure6.doCall(Gant.groovy)
at gant.Gant.withBuildListeners(Gant.groovy:344)
at gant.Gant.this$2$withBuildListeners(Gant.groovy)
at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
at gant.Gant.dispatch(Gant.groovy:334)
at gant.Gant.this$2$dispatch(Gant.groovy)
at gant.Gant.invokeMethod(Gant.groovy)
at gant.Gant.processTargets(Gant.groovy:495)
at gant.Gant.processTargets(Gant.groovy:480)