Rust: no longer reload files into the RootDatabase

Files were reloaded to handle cases were there was no content
for a file_id, causing a panic. Missing contents was caused by
files that did not contain valid UTF-8 data. These are skipped
by rust-analyzer when it is loading data into the RootDatabase.

rust/extractor/src/main.rs

@@ -17,7 +17,7 @@ mod translate;
 pub mod trap;
 
 fn extract(
-    rust_analyzer: &mut rust_analyzer::RustAnalyzer,
+    rust_analyzer: &rust_analyzer::RustAnalyzer,
     archiver: &Archiver,
     traps: &trap::TrapFileProvider,
     file: &std::path::Path,