Update the autonym for Bodo (brx)

The old autonym was actually written in Hindi and not in Bodo.

The new autonym is taken from http://bodosahityasabha.org/ .

data/langdb.yaml

@@ -77,7 +77,7 @@ languages:
   bqi: [Arab, [AS, ME], بختیاری]
   br: [Latn, [EU], brezhoneg]
   brh: [Latn, [ME, AS], Bráhuí]
-  brx: [Deva, [AS], बड़ो]
+  brx: [Deva, [AS], "बर'"]
   bs: [Latn, [EU], bosanski]
   bto: [Latn, [AS], Iriga Bicolano]
   bug: [Bugi, [AS], ᨅᨔ ᨕᨘᨁᨗ]

language-data.json

@@ -483,7 +483,7 @@
             [
                 "AS"
             ],
-            "बड़ो"
+            "बर'"
         ],
         "bs": [
             "Latn",