models : handle spaces and special characters in shell script paths (ggml-org#677)

This commit modifies the `get_script_path` function to correctly handle
spaces and special characters in directory paths. The fix involves adding
double quotes around variables and commands where needed to ensure proper
parsing of paths with spaces and special characters.

Author: be-next

models/download-ggml-model.sh

@@ -12,7 +12,7 @@ pfx="resolve/main/ggml"
 # get the path of this script
 function get_script_path() {
     if [ -x "$(command -v realpath)" ]; then
-        echo "$(dirname $(realpath $0))"
+        echo "$(dirname "$(realpath "$0")")"
     else
         local ret="$(cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P)"
         echo "$ret"