[3.x] Fix Color.v integer assignment

[timothyqiu]

get_v() was provided for the S parameter of set_hsv().

So assigning Color.v with an integer value would also set S to the old V:

extends SceneTree

func _init():
	var c = Color.from_hsv(0.58, 0.5, 0.79, 0.8)
	print("H:%.2f  S:%.2f  V:%.2f" % [c.h, c.s, c.v])

	c.v = 1
	print("H:%.2f  S:%.2f  V:%.2f" % [c.h, c.s, c.v])

	quit()

# Prints:
# H:0.58  S:0.50  V:0.79
# H:0.58  S:0.79  V:1.00

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.4.1.