Revert "Re-added credits errors"

This reverts commit 7381b20.

Author: nsingh-branch

BranchSDK/NSError+Branch.h

@@ -19,7 +19,6 @@ NS_ASSUME_NONNULL_BEGIN
 typedef NS_ENUM(NSInteger, BNCErrorCode) {
     BNCInitError                    = 1000,
     BNCDuplicateResourceError       = 1001,
-    BNCRedeemCreditsError           = 1002, //Deprecated
     BNCBadRequestError              = 1003,
     BNCServerProblemError           = 1004,
     BNCNilLogError                  = 1005, // Not used at the moment.
@@ -29,7 +28,6 @@ typedef NS_ENUM(NSInteger, BNCErrorCode) {
     BNCContentIdentifierError       = 1009,
     BNCSpotlightNotAvailableError   = 1010,
     BNCSpotlightTitleError          = 1011,
-    BNCRedeemZeroCreditsError       = 1012, //Deprecated
     BNCSpotlightIdentifierError     = 1013,
     BNCSpotlightPublicIndexError    = 1014,
     BNCTrackingDisabledError        = 1015,

BranchSDK/NSError+Branch.m

@@ -28,7 +28,6 @@ + (NSString *) messageForCode:(BNCErrorCode)code {
         messages = [NSMutableDictionary<NSNumber *, NSString *> new];
         [messages setObject:@"The Branch user session has not been initialized." forKey:@(BNCInitError)];
         [messages setObject:@"A resource with this identifier already exists." forKey:@(BNCDuplicateResourceError)];
-        [messages setObject:@"You're trying to redeem more credits than are available. Have you loaded rewards?" forKey:@(BNCRedeemCreditsError)]; //Deprecated
         [messages setObject:@"The network request was invalid." forKey:@(BNCBadRequestError)];
         [messages setObject:@"Trouble reaching the Branch servers, please try again shortly." forKey:@(BNCServerProblemError)];
         [messages setObject:@"Can't log error messages because the logger is set to nil." forKey:@(BNCNilLogError)];
@@ -38,7 +37,6 @@ + (NSString *) messageForCode:(BNCErrorCode)code {
         [messages setObject:@"A canonical identifier or title are required to uniquely identify content." forKey:@(BNCContentIdentifierError)];
         [messages setObject:@"The Core Spotlight indexing service is not available on this device." forKey:@(BNCSpotlightNotAvailableError)];
         [messages setObject:@"Spotlight indexing requires a title." forKey:@(BNCSpotlightTitleError)];
-        [messages setObject:@"Can't redeem zero credits." forKey:@(BNCRedeemZeroCreditsError)]; // Deprecated
         [messages setObject:@"The Spotlight identifier is required to remove indexing from spotlight." forKey:@(BNCSpotlightIdentifierError)];
         [messages setObject:@"Spotlight cannot remove publicly indexed content." forKey:@(BNCSpotlightPublicIndexError)];
         [messages setObject:@"User tracking is disabled and the request is not allowed" forKey:@(BNCTrackingDisabledError)];