Correct a floor numbering error in Mt. Coronet

The small room on Mt. Coronet 4F was labelled as 5F,
causing all subsequent floors to be numbered off-by-one.

pokedex/data/csv/location_area_prose.csv

@@ -15,9 +15,9 @@ location_area_id,local_language_id,name
 14,9,snowfall
 15,9,blizzard
 16,9,4F
-17,9,5F
-18,9,6F
-19,9,7F
+17,9,4F small room
+18,9,5F
+19,9,6F
 20,9,cave
 21,9,Route 216
 22,9,Route 211

pokedex/data/csv/location_areas.csv

@@ -15,9 +15,9 @@ id,location_id,game_index,identifier
 14,10,14,snowfall
 15,10,15,blizzard
 16,10,16,4f
-17,10,17,5f
-18,10,18,6f
-19,10,19,7f
+17,10,17,4f-small-room
+18,10,18,5f
+19,10,19,6f
 20,10,20,cave
 21,10,21,route-216
 22,10,22,route-211