fix: Properly set project_root prefix (#474)

It should be `file://` not `file:/`

Author: varungandhi-src

indexer/Driver.cc

@@ -1046,7 +1046,7 @@ class Driver {
     scip::Metadata metadata;
     auto projectRootUnixStyle = llvm::sys::path::convert_to_slash(
         this->options.projectRootPath.asRef().asStringView());
-    metadata.set_project_root("file:/" + projectRootUnixStyle);
+    metadata.set_project_root("file://" + projectRootUnixStyle);
     metadata.set_version(scip::UnspecifiedProtocolVersion);
     metadata.set_text_document_encoding(scip::TextEncoding::UTF8);
     *metadata.mutable_tool_info() = std::move(toolInfo);