make variable type more slim

public/app/types/templates.ts

@@ -1,19 +1,5 @@
 export interface Variable {
-  datasource: any;
-  query: any;
-  regex: any;
-  sort: any;
-  options: any;
-  current: any;
-  refresh: number;
-  hide: number;
   name: string;
-  multi: boolean;
-  includeAll: boolean;
-  useTags: boolean;
-  tagsQuery: string;
-  tagValuesQuery: string;
-  tags: any[];
-  skipUrlSync: boolean;
-  definition: string;
+  type: string;
+  current: any;
 }