fix(run): makes run never prompt

`watch` and `verify` do prompt the user to actively move to the
next exercise. This change fixes `run` to never prompt. Previously
it was inconsistent between "test" and "compile" exercises.

BREAKING CHANGE: we again change the behavior of the `run` command

src/run.rs

@@ -5,9 +5,7 @@ use indicatif::ProgressBar;
 
 pub fn run(exercise: &Exercise) -> Result<(), ()> {
     match exercise.mode {
-        Mode::Test => {
-            test(exercise)?;
-        }
+        Mode::Test => test(exercise)?,
         Mode::Compile => compile_and_run(exercise)?,
     }
     Ok(())