restore stream falgs after printing hash

src/hash.cpp

@@ -116,11 +116,15 @@ std::ostream& operator<<(std::ostream& str, const Hash& rhs) {
 		return str << "[empty hash]";
 	}
 
+	std::ios_base::fmtflags flags = str.flags();
+
 	str << std::hex << std::setfill('0');
 
 	for(size_t i = 0; i < HASHSIZE; ++i) {
 		str << std::setw(2) << (int) rhs.data[i];
 	}
 
+	str.setf(flags);
+
 	return str;
 }