Fix 2 shadowing warnings in bloom.cpp
Fix 2 shadowing warnings in bloom.cpp

bloom.cpp: In member function ‘void CRollingBloomFilter::insert(const uint256&)’:
bloom.cpp:335:32: warning: declaration of ‘data’ shadows a member of ‘CRollingBloomFilter’ [-Wshadow]
     vector<unsigned char> data(hash.begin(), hash.end());
                                ^
In file included from bloom.cpp:6:0:
bloom.h:180:27: note: shadowed declaration is here
     std::vector<uint64_t> data;
                           ^
bloom.cpp: In member function ‘bool CRollingBloomFilter::contains(const uint256&) const’:
bloom.cpp:358:32: warning: declaration of ‘data’ shadows a member of ‘CRollingBloomFilter’ [-Wshadow]
     vector<unsigned char> data(hash.begin(), hash.end());
                                ^
In file included from bloom.cpp:6:0:
bloom.h:180:27: note: shadowed declaration is here
     std::vector<uint64_t> data;

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