Fix Hasklug ligature removal

[why]
Entering two consecutive vertical-bars (i.e. `||`) results in the
display of just one - the right - bar glyph.

[how]
The ligature removal is only partially implemented. The rule at work
here is not removed. There are two parts at work:

One rule to replace the first bar with nothing.

One rule to replace the second bar with a ligarture glyph with negative
left bearing, that shows two bars.

The second rule has been removed, but the first is still there.
This commit also removes the first rule.

[note]
The whole design here is broken. We remove only some rules and leave
others intact, for reasons unknown to me. Other ligartures will also be
only partially removed and leave the user with unreadable output.

We should either remove all (!) tables and not just some, or leave the
ligatures in the font.

As the ligature removal has been broken at large anyhow (see previous
commit), I would suggest to not remove any ligatures (anymore).

Fixes: #934

Reported-by: Rádler Ákos <akos.radler@gmail.com>
Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

src/unpatched-fonts/Hasklig/config.json

@@ -24,4 +24,5 @@
 		"Single Substitution lookup 106 subtable",
 		"Single Substitution lookup 107 subtable",
 		"Single Substitution lookup 109 subtable",
-		"Single Substitution lookup 110 subtable" ]
+		"Single Substitution lookup 110 subtable",
+		"Single Substitution lookup 111 subtable" ]