Keep the environment properly set. (#3072)

* Revert "fix prompts on startup (#3056)"

This reverts commit b202951c1d.

* Ensure environment variables synced with global internal Nu Scope.

crates/nu-command/src/commands/with_env.rs

@@ -80,6 +80,7 @@ async fn with_env(raw_args: CommandArgs) -> Result<OutputStream, ShellError> {
     ) = raw_args.process().await?;
 
     block.block.set_redirect(redirection);
+
     let mut env = IndexMap::new();
 
     match &variable.value {

crates/nu-command/src/script.rs

@@ -186,6 +186,7 @@ pub async fn process_script(
 
         ctx.scope.add_env_to_base(env);
         let result = run_block(&block, ctx, input_stream).await;
+
         match result {
             Ok(input) => {
                 // Running a pipeline gives us back a stream that we can then