Correct tools directory copy command in Dockerfile (vllm-project#171)

Fix the copy command for tools directory in Dockerfile.

Signed-off-by: yuluo-yx <[email protected]>

Author: yuluo-yx

Dockerfile.extproc

@@ -15,7 +15,6 @@ COPY tools/make/ tools/make/
 COPY Makefile ./
 COPY candle-binding/Cargo.toml candle-binding/
 COPY candle-binding/src/ candle-binding/src/
-Copy tools ./tools
 
 # Use Makefile to build the Rust library
 RUN make rust