chore(generator): remove ionicPage for now (#12347)

Author: mhartington

scripts/templates/page/ts.tmpl

@@ -1,13 +1,13 @@
 import { Component } from '@angular/core';
-import { IonicPage, NavController, NavParams } from 'ionic-angular';
+import { NavController, NavParams } from 'ionic-angular';
 
 /**
  * Generated class for the $CLASSNAME page.
  *
  * See http://ionicframework.com/docs/components/#navigation for more info
  * on Ionic pages and navigation.
  */
-@IonicPage()
+
 @Component({
   selector: 'page-$FILENAME',
   templateUrl: '$FILENAME.html',

scripts/templates/tabs/ts.tmpl

@@ -1,5 +1,5 @@
 import { Component } from '@angular/core';
-import { IonicPage, NavController } from 'ionic-angular';
+import { NavController } from 'ionic-angular';
 
 /**
  * Generated class for the $CLASSNAME tabs.
@@ -11,7 +11,6 @@ import { IonicPage, NavController } from 'ionic-angular';
   selector: 'page-$FILENAME',
   templateUrl: '$FILENAME.html'
 })
-@IonicPage()
 export class $CLASSNAME {
 
 $TAB_VARIABLES