Fix CUDA option not appearing on Linux due to preprocessor macro typo (#713)

* Initial plan

* Fix typo: HAVE_ONNXRUNTIME_CUDA_CP -> HAVE_ONNXRUNTIME_CUDA_EP

Co-authored-by: umireon <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: umireon <[email protected]>

Author: Copilot

src/background-filter.cpp

@@ -157,7 +157,7 @@ obs_properties_t *background_filter_properties(void *data)
 							    OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_STRING);
 
 	obs_property_list_add_string(p_use_gpu, obs_module_text("CPU"), USEGPU_CPU);
-#ifdef HAVE_ONNXRUNTIME_CUDA_CP
+#ifdef HAVE_ONNXRUNTIME_CUDA_EP
 	obs_property_list_add_string(p_use_gpu, obs_module_text("GPUCUDA"), USEGPU_CUDA);
 #endif
 #ifdef HAVE_ONNXRUNTIME_ROCM_EP