fix(ui): Disk chart had too many horizontal grid lines

lib/ui/pages/server_details/charts/disk_charts.dart

@@ -1,5 +1,3 @@
-import 'dart:math';
-
 import 'package:easy_localization/easy_localization.dart';
 import 'package:fl_chart/fl_chart.dart';
 import 'package:flutter/material.dart';
@@ -63,13 +61,7 @@ class DiskChart extends StatelessWidget {
   }
 
   @override
-  Widget build(final BuildContext context) {
-    final diskDataMax = [
-      ...diskData.map<List<double>>(
-        (final disk) => disk.diskData.map((final e) => e.value).toList(),
-      ),
-    ].expand((final x) => x).reduce(max);
-    return Semantics(
+  Widget build(final BuildContext context) => Semantics(
         label: screenReaderDescription(context),
         child: LineChart(
           LineChartData(
@@ -149,8 +141,9 @@ class DiskChart extends StatelessWidget {
                           period,
                         ),
                         style: Theme.of(context).textTheme.labelSmall?.copyWith(
-                            color:
-                                Theme.of(context).colorScheme.onSurfaceVariant,
+                              color: Theme.of(context)
+                                  .colorScheme
+                                  .onSurfaceVariant,
                             ),
                       ),
                     ),
@@ -171,7 +164,7 @@ class DiskChart extends StatelessWidget {
               show: true,
               drawVerticalLine: true,
               verticalInterval: 40,
-            horizontalInterval: diskDataMax * 2 / 6.5,
+              horizontalInterval: 25,
               getDrawingHorizontalLine: (final value) => FlLine(
                 color: Theme.of(context).colorScheme.outline.withOpacity(0.3),
                 strokeWidth: 1,
@@ -205,7 +198,6 @@ class DiskChart extends StatelessWidget {
           ),
         ),
       );
-  }
 
   bool checkToShowTitle(
     final double minValue,