wallet2: disable height based segregation

It can still be enable via DNS if a key reusing fork pops up

src/wallet/wallet2.cpp

@@ -114,9 +114,9 @@ using namespace cryptonote;
 
 #define OUTPUT_EXPORT_FILE_MAGIC "Monero output export\003"
 
-#define SEGREGATION_FORK_HEIGHT 1546000
-#define TESTNET_SEGREGATION_FORK_HEIGHT 1000000
-#define STAGENET_SEGREGATION_FORK_HEIGHT 1000000
+#define SEGREGATION_FORK_HEIGHT 99999999
+#define TESTNET_SEGREGATION_FORK_HEIGHT 99999999
+#define STAGENET_SEGREGATION_FORK_HEIGHT 99999999
 #define SEGREGATION_FORK_VICINITY 1500 /* blocks */
 
 #define FIRST_REFRESH_GRANULARITY     1024