reenable searching

I'm not sure why it was disabled in the first place, but it started
affecting users after #496 was
merged.

Author: jyn514

src/docbuilder/rustwide_builder.rs

@@ -388,7 +388,6 @@ impl RustwideBuilder {
             format!("-{}", parse_rustc_version(&self.rustc_version)?),
             "--static-root-path".to_string(),
             "/".to_string(),
-            "--disable-per-crate-search".to_string(),
         ];
         for dep in &cargo_metadata.root_dependencies() {
             rustdoc_flags.push("--extern-html-root-url".to_string());