fix(opener): use the correct packagename in OpenerPlugin.kt (#2207)

plugins/opener/android/src/main/java/OpenerPlugin.kt

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-License-Identifier: MIT
 
-package app.tauri.shell
+package app.tauri.opener
 
 import android.app.Activity
 import android.content.Intent
@@ -27,4 +27,4 @@ class OpenerPlugin(private val activity: Activity) : Plugin(activity) {
             invoke.reject(ex.message)
         }
     }
-}
+}