xtables-translate: Fix for interfaces with asterisk mid-string

xtables-translate: Fix for interfaces with asterisk mid-string

For nft, asterisk is special at end of the interface name only. Escaping
it mid-string makes the escape char part of the interface name, so avoid
this.

In the test case, also drop the ticks around interface names in
*-translate command - since there's no shell involved which would eat
them, they become part of the interface name.

Fixes: e179e87a1179e ("xtables-translate: Fix for interface name corner-cases")
Signed-off-by: Phil Sutter <phil@nwl.cc>