fix: Cannot change send on enter on desktop

lib/config/app_config.dart

@@ -47,7 +47,7 @@ abstract class AppConfig {
   static bool separateChatTypes = false;
   static bool autoplayImages = true;
   static bool sendTypingNotifications = true;
-  static bool sendOnEnter = false;
+  static bool? sendOnEnter;
   static bool experimentalVoip = false;
   static const bool hideTypingUsernames = false;
   static const bool hideAllStateEvents = false;

lib/pages/chat/chat_input_row.dart

@@ -251,7 +251,9 @@ class ChatInputRow extends StatelessWidget {
                     autofocus: !PlatformInfos.isMobile,
                     keyboardType: TextInputType.multiline,
                     textInputAction:
-                        AppConfig.sendOnEnter ? TextInputAction.send : null,
+                        AppConfig.sendOnEnter ?? !PlatformInfos.isMobile
+                            ? TextInputAction.send
+                            : null,
                     onSubmitted: controller.onInputBarSubmitted,
                     onSubmitImage: controller.sendImageFromClipBoard,
                     focusNode: controller.inputFocus,

lib/pages/chat/input_bar.dart

@@ -394,9 +394,7 @@ class InputBar extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final useShortCuts = (PlatformInfos.isWeb ||
-        PlatformInfos.isDesktop ||
-        AppConfig.sendOnEnter);
+    final useShortCuts = (AppConfig.sendOnEnter ?? !PlatformInfos.isMobile);
     return Shortcuts(
       shortcuts: !useShortCuts
           ? {}

lib/pages/settings_chat/settings_chat_view.dart

@@ -74,7 +74,7 @@ class SettingsChatView extends StatelessWidget {
                 title: L10n.of(context)!.sendOnEnter,
                 onChanged: (b) => AppConfig.sendOnEnter = b,
                 storeKey: SettingKeys.sendOnEnter,
-                defaultValue: AppConfig.sendOnEnter,
+                defaultValue: AppConfig.sendOnEnter ?? !PlatformInfos.isMobile,
               ),
               SettingsSwitchListTile.adaptive(
                 title: L10n.of(context)!.experimentalVideoCalls,