clippy: Fix a bunch of warnings in script (#32680)

This is just a portion of the errors that are remaining to be fixed.

components/net/local_directory_listing.rs

@@ -73,7 +73,7 @@ pub fn build_html_directory_listing(
         if let Ok(mut path_segments) = parent_url.path_segments_mut() {
             path_segments.pop();
         }
-        parent_url_string = parent_url.as_str().to_owned();
+        parent_url.as_str().clone_into(&mut parent_url_string);
     }
 
     page_html.push_str(&read_string(Resource::DirectoryListingHTML));
@@ -126,7 +126,7 @@ fn write_directory_entry(entry: DirEntry, metadata: Metadata, url: &Url, output:
     let file_size = metadata_to_file_size_string(&metadata);
     let last_modified = metadata
         .modified()
-        .map(|time| DateTime::<Local>::from(time))
+        .map(DateTime::<Local>::from)
         .map(|time| time.format("%F %r").to_string())
         .unwrap_or_default();
 
@@ -154,5 +154,5 @@ pub fn metadata_to_file_size_string(metadata: &Metadata) -> String {
         _ => "GB",
     };
 
-    return format!("{:.2} {prefix}", float_size);
+    format!("{:.2} {prefix}", float_size)
 }

components/net/mime_classifier.rs

@@ -565,14 +565,14 @@ impl MIMEChecker for GroupedClassifier {
 }
 
 enum Match {
+    None,
     Start,
-    DidNotMatch,
     StartAndEnd,
 }
 
 impl Match {
     fn chain<F: FnOnce() -> Match>(self, f: F) -> Match {
-        if let Match::DidNotMatch = self {
+        if let Match::None = self {
             return f();
         }
         self
@@ -584,7 +584,7 @@ where
     T: Iterator<Item = &'a u8> + Clone,
 {
     if !matcher.matches(start) {
-        Match::DidNotMatch
+        Match::None
     } else if end.len() == 1 {
         if matcher.any(|&x| x == end[0]) {
             Match::StartAndEnd
@@ -630,7 +630,7 @@ impl FeedsClassifier {
                 .chain(|| eats_until(&mut matcher, b"!", b">"))
             {
                 Match::StartAndEnd => continue,
-                Match::DidNotMatch => {},
+                Match::None => {},
                 Match::Start => return None,
             }
 
@@ -658,7 +658,7 @@ impl FeedsClassifier {
                         )
                     }) {
                         Match::StartAndEnd => return Some("application/rss+xml".parse().unwrap()),
-                        Match::DidNotMatch => {},
+                        Match::None => {},
                         Match::Start => return None,
                     }
                 }