refactor(client): more specific info when player inventory is not loaded

People keep attributing this to the target inventory not being
loaded, e.g. stash is not registered.

client.lua

@@ -45,7 +45,7 @@ plyState:set('canUseWeapons', false, false)
 
 local function canOpenInventory()
     if not PlayerData.loaded then
-        return shared.info('cannot open inventory', '(is not loaded)')
+        return shared.info('cannot open inventory', '(player inventory has not loaded)')
     end
 
     if IsPauseMenuActive() then return end