Properly fix the assignment of Control characters in keymap.tcl

[cwervo]

ab1541b fixes this issue but feels like a hack. I have a hunch that the proper fix is to avoid adding Control_* characters to the list of chars or modifying resolve directly but I can't grok or debug it well tonight.

folk/lib/keymap.tcl

Lines 214 to 224 in b410c06

	# takes km, keycode and mod-bitfield, returns [ksym char] tuple
	# char is printable representation of ksym, or "" if unprintable
	proc resolve {km code mod} {
	lassign $km ksyms chars
	set kk "$code $mod"
	if {![dict exists $ksyms $kk]} return
	return [list [dict get $ksyms $kk] [dict_getdef $chars $kk ""]]
	}

[cwervo]

@s-ol curious if you noticed issues with the keyboard editors (not being able to use any of the Control_* commands to save print, move to the front/end of lines) and if you have thoughts on whether or not the commit above is a hack?