Fix screenshot script on windows

[Benjythebee]

Edit the take-screenshot script for support on windows:
Change line 19 of take-screenshot to the following condition:

            if [[ "$OSTYPE" == "win32" ]]  ||  [[ "$OSTYPE" == "msys" ]]; then
                if node node_modules/@shopify/screenshot-glb/dist/cli.js -i "$file" -w 512 -h 512 -m "orientation=0 0 -2.4" -o "$png_file"; then
                    echo "Screenshot of $vrm_filename saved as $(basename "$vrm_filename" .vrm).png"
                else
                    echo "Failed to take a screenshot of $vrm_filename"
                fi
            else
                if node ./node_modules/.bin/screenshot-glb -i "$file" -w 512 -h 512 -m "orientation=0 0 -2.4" -o "$png_file"; then
                    echo "Screenshot of $vrm_filename saved as $(basename "$vrm_filename" .vrm).png"
                else
                    echo "Failed to take a screenshot of $vrm_filename"
                fi
            fi

Also note that orientation takes in radians;
in the code above, -2.4 is to make a VRM0 face forward to the right; This might not be desired for a VRM1