chore: improve stk menu handling

app-unpriv/src/main/java/im/angry/openeuicc/ui/UnprivilegedEuiccManagementFragment.kt

@@ -44,7 +44,7 @@ class UnprivilegedEuiccManagementFragment : EuiccManagementFragment() {
                 val packageName = intent.data!!.schemeSpecificPart
                 val label = requireContext().packageManager.getApplicationLabel(packageName)
                 val message = getString(R.string.toast_prompt_to_enable_sim_toolkit, label)
-                Toast.makeText(context, message, Toast.LENGTH_LONG).show()
+                Toast.makeText(requireContext(), message, Toast.LENGTH_LONG).show()
             }
             return super.onOptionsItemSelected(item)
         }