Update powershell.txt to solve uncatched hook action error

Thie change can avoid zoxide hook to influence user's handling of $Error varible.
For example, if it is still unhandled, the zoxide init error will be propagated to user's  scope. Thus it will make user's script can't work as their expects.

templates/powershell.txt

@@ -80,7 +80,12 @@ function global:__zoxide_hook {
 {%- endif %}
 
 # Initialize hook.
-$global:__zoxide_hooked = (Get-Variable __zoxide_hooked -ErrorAction Ignore -ValueOnly)
+try {
+    $global:__zoxide_hooked = (Get-Variable __zoxide_hooked -ValueOnly -ErrorAction Stop)
+} catch {
+    $global:__zoxide_hooked = 1
+    $Error.RemoveAt(0) # remove the lastest Get-Variable error
+}
 if ($global:__zoxide_hooked -ne 1) {
     $global:__zoxide_hooked = 1
     $global:__zoxide_prompt_old = $function:prompt