fix: optimization: PVS-Studio warning V821

Creating variables in a more localized scope can enhance performance and make the code easier to understand.

Reported by: PVS-Studio
Signed-off-by: Vyacheslav Ivanov <islavaivanov76@gmail.com>

src/graphics/render/WorldRenderer.cpp

@@ -246,13 +246,13 @@ void WorldRenderer::renderBlockSelection() {
 void WorldRenderer::renderLines(
     Camera* camera, Shader* linesShader, const DrawContext& pctx
 ) {
-    auto ctx = pctx.sub(lineBatch.get());
     linesShader->use();
     linesShader->uniformMatrix("u_projview", camera->getProjView());
     if (player->selection.vox.id != BLOCK_VOID) {
         renderBlockSelection();
     }
     if (player->debug && showEntitiesDebug) {
+        auto ctx = pctx.sub(lineBatch.get());
         bool culling = engine->getSettings().graphics.frustumCulling.get();
         level->entities->renderDebug(
             *lineBatch, culling ? frustumCulling.get() : nullptr, ctx);