Fixed test formatting

There were some minor formatting issues with how the test_rm.rs file
looked (I wrote the code on my phone, jaja) so I tidied it up.

tests/by-util/test_rm.rs

@@ -153,14 +153,18 @@ fn test_rm_errors() {
 
 }
 
-#[test]                                                         fn test_rm_dir_not_empty() {
+#[test]
+fn test_rm_dir_not_empty() {
     let (at, mut ucmd) = at_and_ucmd!();
-    let dir = "test_rm_errors_directory";                           let file = "test_rm_errors_directory/test_rm_errors_file";
-                                                                    at.mkdir(dir);
-    at.touch(file);                                                               
+    let dir = "test_rm_errors_directory";
+    let file = "test_rm_errors_directory/test_rm_errors_file";
+
+    at.mkdir(dir);
+    at.touch(file);
 
-    // rm: cannot remove 'test_rm_errors_directory_2': Directory not empty              
-    ucmd.arg("-d").arg(dir).fails().stderr_is(                          "rm: cannot remove 'test_rm_errors_directory': Directory not empty\n"
+    // rm: cannot remove 'test_rm_errors_directory': Directory not empty
+    ucmd.arg("-d").arg(dir).fails().stderr_is(
+        "rm: cannot remove 'test_rm_errors_directory': Directory not empty\n"
     );
 
 }