make sure it works for zsh too

Author: smoors

init/modules/EESSI/2023.06.lua

@@ -225,10 +225,10 @@ if os.getenv("EESSI_MODULE_UPDATE_PS1") then
         local prefix = "{EESSI/" .. eessi_version .. "} "
         if mode() == "load" then
             -- Prepend prefix to PS1 without evaluating its contents
-            execute{cmd="PS1='" .. prefix .. "'\"$PS1\"", modeA={"load"}}
+            execute{cmd="PS1=\"" .. prefix .. "$PS1\"", modeA={"load"}}
         elseif mode() == "unload" then
             -- Strip the prefix from beginning of PS1
-            execute{cmd="PS1=\"${PS1#'" .. prefix .. "'}\"", modeA={"unload"}}
+            execute{cmd="PS1=\"${PS1#\"" .. prefix .. "\"}\"", modeA={"unload"}}
         end
     end
 end