resolve half of the integer_arithmetic lints, couple misc changes

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/service/media/mod.rs

@@ -188,7 +188,7 @@ impl Service {
 				Ok(duration) => {
 					debug!("Parsed duration: {:?}", duration);
 					debug!("System time now: {:?}", SystemTime::now());
-					SystemTime::now() - duration
+					SystemTime::now().checked_sub(duration).unwrap()
 				},
 				Err(e) => {
 					error!("Failed to parse user-specified time duration: {}", e);