Change glyph shown for an em dash (U+2014) from the current en dash – to a real em dash —.

Reference: /n/sources/patch/applied/keyboard-emdash
Date: Wed Oct  4 20:11:36 CES 2006
Signed-off-by: JoelCSalomon@Gmail.com

--- /lib/keyboard	Wed Oct  4 20:09:43 2006
+++ /lib/keyboard	Wed Oct  4 20:09:42 2006
@@ -410,7 +410,7 @@
 207E  s)          ⁾	superscript closing parenthesis
 207F  sn          ⁿ	superscript latin small letter n
 2013  en          –	en dash
-2014  em          –	em dash
+2014  em         —	em dash
 2080  b0          ₀	subscript digit zero
 2081  b1          ₁	subscript digit one
 2082  b2          ₂	subscript digit two