Fix typo

This typo just made me lose my mind on the conan package update. please merge.

Author: Murazaki

cmake/OpenCVFindOpenEXR.cmake

@@ -88,7 +88,7 @@ FOREACH(SEARCH_PATH ${SEARCH_PATHS})
     ocv_find_openexr("-${OPENEXR_VERSION}")
     ocv_find_openexr("-${OPENEXR_VERSION}_s")
     ocv_find_openexr("-${OPENEXR_VERSION}_d")
-    ocv_find_openexr("-${OPEXEXR_VERSION}_s_d")
+    ocv_find_openexr("-${OPENEXR_VERSION}_s_d")
     ocv_find_openexr("")
     ocv_find_openexr("_s")
     ocv_find_openexr("_d")