[Rspamd] Fix scores of UCE

data/conf/rspamd/local.d/rbl_group.conf

@@ -1,8 +1,8 @@
 symbols = {
   "RBL_UCEPROTECT_LEVEL1" {
-    score = 2.5;
+    score = 3.5;
   }
   "RBL_UCEPROTECT_LEVEL2" {
-    score = 3.5;
+    score = 1.5;
   }
 }