Fix clippy warnings

- `clippy::no_effect_underscore_binding`
- `clippy::unnecessary_fallible_conversions`

src/commands/subs.rs

@@ -489,7 +489,7 @@ async fn mods(
 async fn mods_muted(
     ctx: &Context,
     interaction: &Interaction,
-    _opts: &[CommandDataOption],
+    _: &[CommandDataOption],
 ) -> Result<(), Error> {
     let channel_id = interaction.channel_id().unwrap();
     let excluded = ctx.subscriptions.list_excluded_mods(channel_id)?;
@@ -670,7 +670,7 @@ async fn users(
 async fn users_muted(
     ctx: &Context,
     interaction: &Interaction,
-    _opts: &[CommandDataOption],
+    _: &[CommandDataOption],
 ) -> Result<(), Error> {
     let channel_id = interaction.channel_id().unwrap();
     let excluded = ctx.subscriptions.list_excluded_users(channel_id)?;

src/main.rs

@@ -6,6 +6,7 @@
     clippy::wildcard_imports
 )]
 
+use std::convert::Infallible;
 use std::path::PathBuf;
 
 use dotenv::dotenv;
@@ -65,7 +66,7 @@ async fn try_main() -> CliResult {
     }
 
     let path = args
-        .opt_value_from_os_str("-c", |s| PathBuf::try_from(s))?
+        .opt_value_from_os_str("-c", |s| Ok::<_, Infallible>(PathBuf::from(s)))?
         .unwrap_or_else(|| PathBuf::from("bot.toml"));
 
     let config = config::load_from_file(&path)