Make the tests for examples from the RFC look more exactly like the RFC.

By using BASE64URLNOPAD from VMOD blob.

src/tests/decrypt.vtc

@@ -28,10 +28,10 @@ varnish v1 -arg "-p vsl_mask=+VfpAcct" -vcl+backend {
 	import blob;
 
 	sub vcl_init {
-		ece.set_key("", blob.decode(BASE64,
-		                           encoded="yqdlZ+tYemfogSmv7Ws5PQ=="));
-		ece.set_key("a1", blob.decode(BASE64,
-		                           encoded="BO3ZVPxUlnLORbVGMpbT1Q=="));
+		ece.set_key("", blob.decode(BASE64URLNOPAD,
+		                            encoded="yqdlZ-tYemfogSmv7Ws5PQ"));
+		ece.set_key("a1", blob.decode(BASE64URLNOPAD,
+		                             encoded="BO3ZVPxUlnLORbVGMpbT1Q"));
 	}
 
 	sub vcl_backend_response {

src/tests/encrypt.vtc

@@ -22,8 +22,8 @@ varnish v1 -arg "-p vsl_mask=+VfpAcct" -vcl+backend {
 	import blob;
 
 	sub vcl_init {
-		ece.set_key("", blob.decode(BASE64,
-		                           encoded="yqdlZ+tYemfogSmv7Ws5PQ=="));
+		ece.set_key("", blob.decode(BASE64URLNOPAD,
+		                            encoded="yqdlZ-tYemfogSmv7Ws5PQ"));
 	}
 
 	# When set-salt is enabled, the base64-encoded salt can be