EuiccManagementFragment: Add nonnull assertion for platform types

Fixes build within AOSP 14 source tree.

app-common/src/main/java/im/angry/openeuicc/ui/EuiccManagementFragment.kt

@@ -296,7 +296,7 @@ open class EuiccManagementFragment : Fragment(), EuiccProfilesChangedListener,
             }
 
             iccid.setOnLongClickListener {
-                requireContext().getSystemService(ClipboardManager::class.java)
+                requireContext().getSystemService(ClipboardManager::class.java)!!
                     .setPrimaryClip(ClipData.newPlainText("iccid", iccid.text))
                 Toast.makeText(requireContext(), R.string.toast_iccid_copied, Toast.LENGTH_SHORT)
                     .show()