Fix unintended renaming of magic string for TDEWallet files

This resolves Bug 1658

TDEWallet remains compatible with KWallet, and therefore
it is not practical to change the magic string. If in the
future will not be possible to maintain compatibility,
magic string will be changed afterwards.

tdeio/magic

@@ -1036,7 +1036,7 @@
 
 #------------------------------------------------------------------------------
 # TDEWallet file
-0	string		TDEWALLET\012\015\000\015\012	application/x-tde-wallet
+0	string		KWALLET\012\015\000\015\012	application/x-tde-wallet
 
 #------------------------------------------------------------------------------
 # ICA Client configuration files

tdewallet/backend/tdewalletbackend.cc

@@ -51,7 +51,7 @@
 
 using namespace TDEWallet;
 
-#define KWMAGIC "TDEWALLET\n\r\0\r\n"
+#define KWMAGIC "KWALLET\n\r\0\r\n"
 #define KWMAGIC_LEN 12
 
 static void initTDEWalletDir()