Adjusted rust installation check to work with windows

software/source/server/services/stt/local-whisper/stt.py

@@ -42,8 +42,8 @@ def install(service_dir):
     # Check if whisper-rust executable exists before attempting to build
     if not os.path.isfile(os.path.join(WHISPER_RUST_PATH, "target/release/whisper-rust")):
         # Check if Rust is installed. Needed to build whisper executable
-        rust_check = subprocess.call('command -v rustc', shell=True)
-        if rust_check != 0:
+        rustc_path = shutil.which("rustc")
+        if rustc_path is None:
             print("Rust is not installed or is not in system PATH. Please install Rust before proceeding.")
             exit(1)