Correct the schematic name of U+1878 (#695)

Buryat is not Manchu.

Author: eggrobin

unicodetools/data/ucd/dev/ArabicShaping.txt

@@ -624,7 +624,7 @@
 1875; MONGOLIAN MANCHU RA; D; No_Joining_Group
 1876; MONGOLIAN MANCHU FA; D; No_Joining_Group
 1877; MONGOLIAN MANCHU ZHA; D; No_Joining_Group
-1878; MONGOLIAN MANCHU CHA WITH 2 DOTS; D; No_Joining_Group
+1878; MONGOLIAN CHA WITH 2 DOTS; D; No_Joining_Group
 1880; MONGOLIAN ALI GALI ANUSVARA ONE; U; No_Joining_Group
 1881; MONGOLIAN ALI GALI VISARGA ONE; U; No_Joining_Group
 1882; MONGOLIAN ALI GALI DAMARU; U; No_Joining_Group