Unused completion handlers leftovers removed

ios/RNFetchBlobNetwork.h

 #define RNFetchBlobNetwork_h
 
 
-typedef void(^CompletionHander)(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error);
-typedef void(^DataTaskCompletionHander) (NSData * _Nullable resp, NSURLResponse * _Nullable response, NSError * _Nullable error);
-
 @interface RNFetchBlobNetwork : NSObject  <NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate>
 
 @property (nullable, nonatomic) NSString * taskId;

ios/RNFetchBlobNetwork.m

 // removing case from headers
 + (NSMutableDictionary *) normalizeHeaders:(NSDictionary *)headers
 {
-
     NSMutableDictionary * mheaders = [[NSMutableDictionary alloc]init];
     for(NSString * key in headers) {
         [mheaders setValue:[headers valueForKey:key] forKey:[key lowercaseString]];