fix patch not applying properly on cachyos

Author: psygreg

patcher.sh

@@ -37,7 +37,7 @@ patch_mesa () {
 
 GPU=$(lspci | grep -i '.* vga .* nvidia .*')
 shopt -s nocasematch
-if [ "$SHELL" = "$(which fish)" ] || [ "$FISH_VERSION" ]; then
+if command -v fish &>/dev/null; then
     if [[ $GPU == *' nvidia '* ]]; then
         set -x --universal __GL_SHADER_DISK_CACHE_SIZE '12000000000'
         echo "$SUCCESS"