remove required attr for caster/host image

src/models/casters.js

@@ -15,7 +15,6 @@ const casters = new Schema({
   },
   image: {
     type: String,
-    required: true,
   }
 });
 

src/models/hosts.js

@@ -15,7 +15,6 @@ const hosts = new Schema({
   },
   image: {
     type: String,
-    required: true,
   }
 });