lib: parser: accept number-only word tokens

There seems to be no reason why numbers don't work as plain word tokens;
this is useful to have "number choices" or constants, e.g. <128|192|256>
for bit encryption lengths.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

lib/command_lex.l

@@ -26,7 +26,7 @@
 #include "command_parse.h"
 %}
 
-WORD (\-|\+)?[a-z\*][-+_a-zA-Z0-9\*]*
+WORD (\-|\+)?[a-z0-9\*][-+_a-zA-Z0-9\*]*
 IPV4 A\.B\.C\.D
 IPV4_PREFIX A\.B\.C\.D\/M
 IPV6 X:X::X:X