fix: make sure asset reference id could be a valid identifier (rolldo…

…wn#2198)

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### Description

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close rolldown/vite#27 (comment)

ref
https://github.com/rollup/rollup/blob/master/src/utils/FileEmitter.ts#L300

crates/rolldown_common/src/file_emitter.rs

@@ -66,6 +66,8 @@ impl FileEmitter {
         })
         .as_bytes(),
     )
+    // The reference id can be used for import.meta.ROLLUP_FILE_URL_referenceId and therefore needs to be a valid identifier.
+    .replace('-', "$")
     .into()
   }