Cedar/Admin.c: fix segmentation fault caused by non-initialized string in StGetServerCipherList()

StrCat() appends a string to an already existing string. In order to know where the existing string ends, it uses StrLen() which in turn uses strlen(), a function considered unsafe because it doesn't stop until it finds the null character.

Since the string was allocated but not initialized, StrCat() was either:

- Working correctly.
- Copying only a part of the string.
- Making the program crash via strlen().

The fix consists in using StrCpy(), which starts writing at the beginning of the string.

src/Cedar/Admin.c

@@ -8156,7 +8156,7 @@ UINT StGetServerCipherList(ADMIN *a, RPC_STR *t)
 		{
 			UINT size = StrSize(ciphers->Token[0]);
 			t->String = Malloc(size);
-			StrCat(t->String, size, ciphers->Token[0]);
+			StrCpy(t->String, size, ciphers->Token[0]);
 			i = 1;
 
 			for (; i < ciphers->NumTokens; i++)