jwt.c: Use original base64 variant

Otherwise, cookies set by previous, OpenSSL-based versions of slcl would
be now invalidated because URL-safe base64 transforms some characters,
thus breaking backwards compatiblity.

For example, '/' is transformed into '_' on the example cookies below:

- Original base64 encoding:

a=eyJhbGciOiAiSFMyNTYiLCAidHlwIjogIkpXVCJ9.eyJuYW1lIjogImEifQ==.jgp/SsraDR/3zlAnDLyj05VHulUNbDNHaPowvUkLto4=

- URL-safe base64 encoding:

a=eyJhbGciOiAiSFMyNTYiLCAidHlwIjogIkpXVCJ9.eyJuYW1lIjogImEifQ==.jgp_SsraDR_3zlAnDLyj05VHulUNbDNHaPowvUkLto4=

1 files changed, 1 insertions, 1 deletions

diff --git a/jwt.c b/jwt.c
index fd5adb1..f00daf7 100644
--- a/jwt.c
+++ b/jwt.c
@@ -7,7 +7,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#define VARIANT sodium_base64_VARIANT_URLSAFE
+#define VARIANT sodium_base64_VARIANT_ORIGINAL
 
 static char *get_payload(const char *const name)
 {