PowerPoint file corrupted when setting adjustments of MSO_SHAPE.UP_DOWN_ARROW

[ok97465]

Hello.

I tried to modify the value of adjustments of MSO_SHAPE.UP_DOWN_ARROW.
But I couldn't open the ppt file. Maybe this problem is caused by the following lines.

python-pptx/pptx/spec.py

Lines 595 to 598 in b31cf20

	MSO_SHAPE.UP_DOWN_ARROW: {
	"basename": "Up-Down Arrow",
	"avLst": (("adj1", 50000), ("adj1", 50000), ("adj2", 50000), ("adj2", 50000)),
	},

I think that this should be changed:

    MSO_SHAPE.UP_DOWN_ARROW: {
        "basename": "Up-Down Arrow",
        "avLst": (("adj1", 50000), ("adj2", 50000)),
    },

Thank you for reading.