Set can climb for entity back to true

This has nothing to do with the bug where players can "climb" up blocks, but rather disabling this feature disables the ability to climb up vines and ladders. This commit reverts that.

connector/src/main/java/org/geysermc/connector/entity/Entity.java

@@ -96,7 +96,7 @@ public class Entity {
         flags.setFlag(EntityFlag.HAS_GRAVITY, true);
         flags.setFlag(EntityFlag.HAS_COLLISION, true);
         flags.setFlag(EntityFlag.CAN_SHOW_NAME, true);
-        flags.setFlag(EntityFlag.CAN_CLIMB, false);
+        flags.setFlag(EntityFlag.CAN_CLIMB, true);
         metadata.putFlags(flags);
     }