Move Surge Alloy in ErekirTechTree to the correct position (#9253)

Surge Alloy can be first obtained on the "Ravine" map.
Thorium can be first obtained on the "Caldera" map.
The "Ravine" map must be unlocked and completed before the "Caldera" map can be accessed.
Since Surge Alloy isn't required to produce Thorium (and vice versa), they should appear at the same level of the tech tree, under Tungsten.

Signed-off-by: Gerald Elder-Vass <geraldev@hotmail.co.uk>

core/src/mindustry/content/ErekirTechTree.java

@@ -447,11 +447,11 @@ public class ErekirTechTree{
 
                                 //nodeProduce(Liquids.gallium, () -> {});
                             });
+                        });
 
-                            nodeProduce(Items.surgeAlloy, () -> {
-                                nodeProduce(Items.phaseFabric, () -> {
+                        nodeProduce(Items.surgeAlloy, () -> {
+                            nodeProduce(Items.phaseFabric, () -> {
 
-                                });
                             });
                         });
                     });