Made water unlocked again

core/src/mindustry/content/Liquids.java

@@ -12,6 +12,7 @@ public class Liquids implements ContentList{
 
         water = new Liquid("water", Color.valueOf("596ab8")){{
             heatCapacity = 0.4f;
+            alwaysUnlocked = true;
             effect = StatusEffects.wet;
         }};