Remove trailing whitespace from touch.rs test module

This commit removes a trailing newline at the end of the test module in src/uu/touch/src/touch.rs to maintain consistent code formatting and eliminate unnecessary whitespace.

src/uu/touch/src/touch.rs

@@ -972,5 +972,4 @@ mod tests {
         assert_eq!(actual_atime, atime);
         assert_eq!(actual_mtime, mtime);
     }
-
 }