Update autonym for the Efik language (#231)

According to
Adams, R. F. G.; Akaduh, Etim; Abia-Bassey, Okon (1981),
Akpanyụñ, Okon A. (ed.), English-Efịk dictionary

data/langdb.yaml

@@ -172,7 +172,7 @@ languages:
   dv: [Thaa, [AS], ދިވެހިބަސް]
   dz: [Tibt, [AS], ཇོང་ཁ]
   ee: [Latn, [AF], eʋegbe]
-  efi: [Latn, [AF], efik]
+  efi: [Latn, [AF], efịk]
   egl: [Latn, [EU], Emiliàn]
   el: [Grek, [EU], Ελληνικά]
   elm: [Latn, [AF], Eleme]

data/language-data.json

@@ -1058,7 +1058,7 @@
             [
                 "AF"
             ],
-            "efik"
+            "efịk"
         ],
         "egl": [
             "Latn",