Removed unnecessary string length check

[radarhere]

#7244 added _string_length_check() in several locations, including TransposedFont.getlength().

Pillow/src/PIL/ImageFont.py

Lines 711 to 716 in 28c173f

	def getlength(self, text, *args, **kwargs):
	if self.orientation in (Image.Transpose.ROTATE_90, Image.Transpose.ROTATE_270):
	msg = "text length is undefined for text rotated by 90 or 270 degrees"
	raise ValueError(msg)
	_string_length_check(text)
	return self.font.getlength(text, *args, **kwargs)

However, getlength() is immediately called after the check, which itself calls _string_length_check().

So this check is unnecessary and can be removed.