bug #48918: Full form of Devanagari ṅka in non-full-form context

Hindi: ङ्क्प looks identical to ङ्कप when historical ligatures are enabled.

Sanskrit ङ्क्प looks identical to ङ्कप when historical ligatures are enabled.

Hindi Old: ङ्क्प looks identical to ङ्कप when historical ligatures are enabled.