refractor(mixpanel): remove pluginMeta variable

src/plugins/media.ts

@@ -67,13 +67,12 @@ export interface MediaError {
  *
  * ```
  */
-let pluginMeta = {
+@Plugin({
   name: 'MediaPlugin',
   repo: 'https://github.com/apache/cordova-plugin-media',
   plugin: 'cordova-plugin-media',
   pluginRef: 'Media'
-};
+})
-@Plugin(pluginMeta)
 export class MediaPlugin {
 
   // Constants
@@ -132,7 +131,10 @@ export class MediaPlugin {
         this._objectInstance = new Media(src, resolve, reject, onStatusUpdate);
       });
     } else {
-      pluginWarn(pluginMeta);
+      pluginWarn({
+        name: 'MediaPlugin',
+        plugin: 'cordova-plugin-media'
+      });
     }
   }
 

src/plugins/mixpanel.ts

@@ -2,10 +2,6 @@ import { Cordova, Plugin } from './plugin';
 
 declare var mixpanel: any;
 
-/**
- * @private
- */
-
 /**
  * @name Mixpanel
  * @description
@@ -112,11 +108,11 @@ export class MixpanelPeople {
   /**
    * @private
    */
-  static plugin: string = pluginMeta.plugin;
+  static plugin: string = 'cordova-plugin-mixpanel';
   /**
    * @private
    */
-  static pluginRef: string = pluginMeta.pluginRef + '.people';
+  static pluginRef: string = 'mixpanel.people';
 
   /**
    *