fix(loc): satisfy newer clippy and stabilise powertest.yaml

- remove redundant #[must_use] on Report::languages (double_must_use)
- use is_multiple_of in the share-bar renderer (manual_is_multiple_of)
- drop a pre-existing needless double-borrow in a view.rs test
- reformat the powertest.yaml comment into yamlfmt's fixed-point form
  (verified stable across repeated yamlfmt runs)

powertest.yaml

@@ -183,8 +183,7 @@ commands:
   ? - -i
     - --inode
   :
-  ? # so only the bare forms are generated here.
-    - null # --loc and --code take their mode via `=` only (lines/percent/both),
+  ? - null # --loc/--code take modes via `=` only, so just the bare forms
     - --loc
   : prefix: -l
   ? - null

src/loc/mod.rs

@@ -230,7 +230,6 @@ impl Report {
     }
 
     /// The per-language rows, ordered by language name.
-    #[must_use]
     pub fn languages(&self) -> impl Iterator<Item = &LangStat> {
         self.languages.values()
     }

src/options/view.rs

@@ -608,7 +608,7 @@ mod tests {
     #[test]
     fn deduce_time_types_changed_word() {
         assert_eq!(
-            TimeTypes::deduce(&&mock_cli(vec!["--time", "changed"])),
+            TimeTypes::deduce(&mock_cli(vec!["--time", "changed"])),
             Ok(TimeTypes {
                 modified: false,
                 changed: true,

src/output/code.rs

@@ -254,7 +254,7 @@ fn bar(value: usize, max: usize) -> String {
     let units = units.max(1);
 
     let mut bar = "█".repeat(units / 8);
-    if units % 8 > 0 {
+    if !units.is_multiple_of(8) {
         bar.push(EIGHTHS[units % 8 - 1]);
     }
     bar