MC-136886: locate command loads chunks without needing to.

Thanks Aikar for the report

nms-patches/StructureGenerator.patch

@@ -0,0 +1,20 @@
+--- a/net/minecraft/server/StructureGenerator.java
++++ b/net/minecraft/server/StructureGenerator.java
+@@ -43,7 +43,7 @@
+                     StructureStart structurestart = this.a(generatoraccess, chunkgenerator, (SeededRandom) random, i2);
+ 
+                     if (structurestart != StructureGenerator.a && structurestart.c().a(l, i1, l + 15, i1 + 15)) {
+-                        ((LongSet) chunkgenerator.getStructureCache(this).computeIfAbsent(j1, (i) -> {
++                        ((LongSet) chunkgenerator.getStructureCache(this).computeIfAbsent(j1, (x) -> { // CraftBukkit - fix decompile error
+                             return new LongOpenHashSet();
+                         })).add(i2);
+                         generatoraccess.getChunkProvider().a(j, k, true).a(this.a(), i2);
+@@ -204,7 +204,7 @@
+                 return structurestart;
+             } else {
+                 ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i);
+-                IChunkAccess ichunkaccess = generatoraccess.getChunkProvider().a(chunkcoordintpair.x, chunkcoordintpair.z, false);
++                IChunkAccess ichunkaccess = generatoraccess.getChunkProvider().getChunkAt(chunkcoordintpair.x, chunkcoordintpair.z, false, false); // CraftBukkit - don't load chunks
+ 
+                 if (ichunkaccess != null) {
+                     structurestart = ichunkaccess.a(this.a());