Fix setting integers in settings on iOS

lib/screens/settings/sections/max_nodes_section.dart

@@ -71,6 +71,7 @@ class _MaxNodesSectionState extends State<MaxNodesSection> {
                 child: TextFormField(
                   controller: _controller,
                   keyboardType: TextInputType.number,
+                  textInputAction: TextInputAction.done,
                   decoration: const InputDecoration(
                     isDense: true,
                     contentPadding: EdgeInsets.symmetric(vertical: 6, horizontal: 8),

lib/screens/settings/sections/proximity_alerts_section.dart

@@ -182,6 +182,7 @@ class _ProximityAlertsSectionState extends State<ProximityAlertsSection> {
                     child: TextField(
                       controller: _distanceController,
                       keyboardType: TextInputType.number,
+                      textInputAction: TextInputAction.done,
                       inputFormatters: [
                         FilteringTextInputFormatter.digitsOnly,
                       ],

lib/screens/settings/sections/suspected_locations_section.dart

@@ -140,6 +140,7 @@ class SuspectedLocationsSection extends StatelessWidget {
                   child: TextFormField(
                     initialValue: appState.suspectedLocationMinDistance.toString(),
                     keyboardType: TextInputType.number,
+                    textInputAction: TextInputAction.done,
                     decoration: const InputDecoration(
                       isDense: true,
                       contentPadding: EdgeInsets.symmetric(vertical: 6, horizontal: 8),