Remove EmitEvent trait import

lang/macro/src/codegen/storage.rs

@@ -54,13 +54,6 @@ impl GenerateCode for Storage<'_> {
         let message_impls = self.generate_message_impls();
         let storage_struct = self.generate_storage_struct();
 
-        let use_emit_event = if !self.contract.events.is_empty() {
-            // Required to allow for `self.env().emit_event(..)` in messages and constructors.
-            quote! { use __ink_private::EmitEvent as _; }
-        } else {
-            quote! {}
-        };
-
         quote_spanned!(storage_span =>
             #[doc(hidden)]
             #conflic_depedency_cfg
@@ -81,7 +74,6 @@ impl GenerateCode for Storage<'_> {
                 #[allow(unused_imports)]
                 use ink_lang::Env as _;
 
-                #use_emit_event
                 #message_impls
             };
         )