Code style: move private constructors for singleton classes to the top of the file

bukkit/src/main/java/me/lucko/luckperms/bukkit/inject/permissible/PermissibleInjector.java

@@ -42,6 +42,7 @@ import java.util.List;
  * checks made by plugins.
  */
 public final class PermissibleInjector {
+    private PermissibleInjector() {}
 
     /**
      * All permission checks made on standard Bukkit objects are effectively proxied to a
@@ -151,6 +152,4 @@ public final class PermissibleInjector {
         }
     }
 
-    private PermissibleInjector() {}
-
 }

bukkit/src/main/java/me/lucko/luckperms/bukkit/migration/BukkitUuids.java

@@ -33,6 +33,7 @@ import org.bukkit.Bukkit;
 import java.util.UUID;
 
 public final class BukkitUuids {
+    private BukkitUuids() {}
 
     public static UUID lookupUuid(ProgressLogger log, String s) {
         UUID uuid = Uuids.parse(s);
@@ -50,6 +51,4 @@ public final class BukkitUuids {
         return uuid;
     }
 
-    private BukkitUuids() {}
-
 }