[Bugfix] Fix parsing of --disable-mm-preprocessor-cache (#22909)

Signed-off-by: DarkLight1337 <[email protected]>

Author: DarkLight1337

vllm/engine/arg_utils.py

@@ -711,7 +711,7 @@ def add_cli_args(parser: FlexibleArgumentParser) -> FlexibleArgumentParser:
             "--mm-processor-cache-gb",
             **multimodal_kwargs["mm_processor_cache_gb"])
         multimodal_group.add_argument("--disable-mm-preprocessor-cache",
-                                      type=bool,
+                                      action="store_true",
                                       deprecated=True)
         multimodal_group.add_argument(
             "--interleave-mm-strings",