Update mbsyncrc to reflect changes in nomenclature

Change the less descriptive and loaded terms Master/Slave for Far/Near

.mbsyncrc

@@ -15,8 +15,8 @@ Channel free
 Far :free-remote:
 Near :free-local:
 Patterns * !Chats !Contacts !"Emailed Contacts"
-Create Slave
-Remove Slave
+Create Far
+Remove Far
 Expunge Both
 SyncState *
 
@@ -38,8 +38,8 @@ Channel aphp
 Far :aphp-remote:
 Near :aphp-local:
 Patterns *
-Create Slave
-Remove Slave
+Create Far
+Remove Far
 Expunge Both
 SyncState *
 
@@ -61,7 +61,7 @@ Channel chno
 Far :chno-remote:
 Near :chno-local:
 Patterns *
-Create Slave
-Remove Slave
+Create Far
+Remove Far
 Expunge Both
 SyncState *