Fix underline position in error message

[dbarenholz]

Previously, this underline (^^^^) did not position correctly when writing your metabind code in a readable way (with newlines and tabs):

INPUT[slider(
	addLabels,
	minValue(0),
	maxValue(100),
	this_is_invalid_oh_no
):slider]

This fix makes it underline at the correction position as shown in the image below.

[mProjectsCode]

thanks for the fix :)