fix: correct invalid self import in delete.rs

The original line `use crate::db::self;` was invalid because `self` cannot be used in a `use` statement outside of a list. Changed to `use crate::db;` to properly import the module.

src/modes/delete.rs

@@ -2,7 +2,7 @@ use anyhow::{Context, Result, anyhow};
 use std::fs;
 use std::path::PathBuf;
 
-use crate::db::self;
+use crate::db;
 use clap::Command;
 use log::{debug, warn};
 use clap::error::ErrorKind;