[wasm-split] Remove ANSI codes from wast output (#7780)

Without this, wast files emitted by `-S` contain extra ANSI codes like
```wast
(^[[31m^[[1mmodule^[[0m
 (^[[31m^[[1mfunc ^[[0m$bar (^[[33mparam ^[[0m$0 i32) (result i32)
  (^[[35m^[[1mcall ^[[0m$foo
   (i32.const ^[[33m777^[[0m)
  )
 )
)
```

wasm-opt has this too, although on `-o` (I think it doesn't matter)

https://github.com/WebAssembly/binaryen/blob/96362ebe5f3eedc9d9a53694a16e375670cd53b1/src/tools/wasm-opt.cpp#L114-L122

Author: aheejin

src/tools/wasm-split/wasm-split.cpp

@@ -567,6 +567,8 @@ void printReadableProfile(const WasmSplitOptions& options) {
 int main(int argc, const char* argv[]) {
   WasmSplitOptions options;
   options.parse(argc, argv);
+  // We don't support --print for wasm-split
+  Colors::setEnabled(false);
 
   if (!options.validate()) {
     Fatal() << "Invalid command line arguments";