change default expiry height to 200 instead of 20. To stop wallet getting corrupted.

src/main.h

@@ -88,7 +88,7 @@ static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 100;
 /** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
 static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
 /** Default for -txexpirydelta, in number of blocks */
-static const unsigned int DEFAULT_TX_EXPIRY_DELTA = 20;
+static const unsigned int DEFAULT_TX_EXPIRY_DELTA = 200;
 /** The maximum size of a blk?????.dat file (since 0.8) */
 static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB 
 static const unsigned int MAX_TEMPFILE_SIZE = 0x1000000; // 16 MiB 0x8000000