build: minor changes

testbed/CMakeLists.txt

@@ -56,7 +56,7 @@ target_sources(
         system/imgui_system.cpp
         system/input_system.cpp
         system/rendering_system.cpp
-		testbed.cpp
+        testbed.cpp
         ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
         ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
         ${imgui_SOURCE_DIR}/imgui.cpp