Resolve deprecation warnings

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java

@@ -171,11 +171,10 @@ public class TunnelEditorFragment extends BaseFragment implements AppExclusionLi
     }
 
     public void onRequestSetExcludedApplications(@SuppressWarnings("unused") final View view) {
-        final FragmentManager fragmentManager = getFragmentManager();
-        if (fragmentManager != null && binding != null) {
+        if (binding != null) {
             final ArrayList<String> excludedApps = new ArrayList<>(binding.getConfig().getInterface().getExcludedApplications());
             final AppListDialogFragment fragment = AppListDialogFragment.newInstance(excludedApps, this);
-            fragment.show(fragmentManager, null);
+            fragment.show(getParentFragmentManager(), null);
         }
     }
 

app/src/main/java/com/wireguard/android/fragment/TunnelListFragment.java

@@ -79,9 +79,7 @@ public class TunnelListFragment extends BaseFragment {
             Config.parse(new ByteArrayInputStream(configText.getBytes(StandardCharsets.UTF_8)));
 
             // Config text is valid, now create the tunnel…
-            final FragmentManager fragmentManager = getFragmentManager();
-            if (fragmentManager != null)
-                ConfigNamingDialogFragment.newInstance(configText).show(fragmentManager, null);
+            ConfigNamingDialogFragment.newInstance(configText).show(getParentFragmentManager(), null);
         } catch (final BadConfigException | IOException e) {
             onTunnelImportFinished(Collections.emptyList(), Collections.singletonList(e));
         }
@@ -220,7 +218,7 @@ public class TunnelListFragment extends BaseFragment {
         binding.createFab.setOnClickListener(v -> {
             final AddTunnelsSheet bottomSheet = new AddTunnelsSheet();
             bottomSheet.setTargetFragment(this, REQUEST_TARGET_FRAGMENT);
-            bottomSheet.show(requireFragmentManager(), "BOTTOM_SHEET");
+            bottomSheet.show(getParentFragmentManager(), "BOTTOM_SHEET");
         });
         binding.executePendingBindings();
         EdgeToEdge.setUpRoot((ViewGroup) binding.getRoot());