webui: Use lowercase hash for HF checksum check (ggml-org#23107)

Author: ozars

scripts/webui-download.cmake

@@ -184,8 +184,8 @@ if(NOT PROVISION_SUCCESS AND HF_ENABLED)
             foreach(asset ${ASSETS})
                 set(download_path "${PUBLIC_DIR}/${asset}")
                 file(SHA256 "${download_path}" asset_hash)
-                string(TOUPPER "${asset_hash}" EXPECTED_HASH_UPPER)
-                string(REGEX MATCH "${EXPECTED_HASH_UPPER}[ \\t]+${asset}" CHECKSUM_LINE "${CHECKSUMS_CONTENT}")
+                string(TOLOWER "${asset_hash}" EXPECTED_HASH_LOWER)
+                string(REGEX MATCH "${EXPECTED_HASH_LOWER}[ \\t]+${asset}" CHECKSUM_LINE "${CHECKSUMS_CONTENT}")
                 if(NOT CHECKSUM_LINE)
                     message(WARNING "WebUI: checksum verification failed for ${asset}")
                     message(WARNING "  downloaded file may not match expected checksum, but will be used")