Fix / extend README

roles/xampp/tasks/main_win.yml

@@ -1,6 +1,7 @@
 - name: Install XAMPP
   win_chocolatey:
     name: xampp-81
+    install_args: ""
 
 - name: Make XAMPP config world writable
   win_acl:
@@ -12,7 +13,7 @@
 - name: Add firewall rules for XAMPP
   win_firewall_rule:
     name: "Allow inbound traffic for XAMPP: {{ item }}"
-    program: "%SystemDrive%\\xampp\\{{ item }}"
+    program: "C:\\xampp\\{{ item }}"
     action: allow
     direction: in
     protocol: tcp