Use .is_multiple_of() in bootstrap

This makes the intent clear, and silences Clippy.

Author: samueltardieu

src/bootstrap/src/utils/render_tests.rs

@@ -202,7 +202,9 @@ impl<'a> Renderer<'a> {
     }
 
     fn render_test_outcome_terse(&mut self, outcome: Outcome<'_>, test: &TestOutcome) {
-        if self.terse_tests_in_line != 0 && self.terse_tests_in_line % TERSE_TESTS_PER_LINE == 0 {
+        if self.terse_tests_in_line != 0
+            && self.terse_tests_in_line.is_multiple_of(TERSE_TESTS_PER_LINE)
+        {
             if let Some(total) = self.tests_count {
                 let total = total.to_string();
                 let executed = format!("{:>width$}", self.executed_tests - 1, width = total.len());