Fix adding ffmpeg to path

This fixes adding ffmpeg to the path by adding it to the user path instead of the system path, which doesn't require admin privileges to do

utils/ffmpeg_install.py

@@ -23,7 +23,7 @@ def ffmpeg_install_windows():
             os.remove(f"ffmpeg/doc/{file}")
         os.rmdir("ffmpeg/doc")
         # Add to the path
-        subprocess.run("setx /M PATH \"%PATH%;%CD%\\ffmpeg\"", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        subprocess.run("setx PATH \"%PATH%;%CD%\\ffmpeg\"", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         print("FFmpeg installed successfully! Please restart your computer and then re-run the program.")
         exit()
     except Exception as e: