Fix OPENCV_DIR type

Author: pierotofy

CMakeLists.txt

@@ -3,7 +3,7 @@ project(opensplat)
 
 set(OPENSPLAT_BUILD_SIMPLE_TRAINER OFF CACHE BOOL "Build simple trainer applications")
 set(GPU_RUNTIME "CUDA" CACHE STRING "HIP or CUDA")
-set(OPENCV_DIR "OPENCV_DIR-NOTFOUND" CACHE "OPENCV_DIR" "Path to the OPENCV installation directory")
+set(OPENCV_DIR "OPENCV_DIR-NOTFOUND" CACHE PATH "Path to the OPENCV installation directory")
 
 if(NOT CMAKE_BUILD_TYPE)
 set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel." FORCE)