FlTitlesData -> leftTitles shows static highest value with overlap on other titles

**Describe the bug**
A picture says more than 1000-words
Titles are correct most of the time, like in the picture below

This static value was not showing in fl_chart v0.40.2 that I used before.

**To Reproduce**
```dart
//Textstyle
TextStyle? verticalSideTitle = Theme.of(context)
.textTheme
.bodyText2
?.copyWith(
fontSize: 10, color: currentTheme.verticalSideTitle);

//Barchart Init
BarChart(BarChartData(
//...
titlesData: FlTitlesData(
show: true,
leftTitles: SideTitles(
showTitles: true,
reservedSize: _reservedVertical,
getTextStyles: (context, value) => verticalSideTitle,
margin: 0,
),
topTitles: SideTitles(showTitles: false),
rightTitles: SideTitles(showTitles: false),
),
//...
));
```

**Versions**
Flutter v2.10.1
fl_chart: 0.45.0

Start with the BarChart and FlTitlesData reproduction shown in the issue, using Flutter 2.10.1 and fl_chart 0.45.0, then compare the title behavior with fl_chart 0.40.2. Trace how leftTitles values are laid out and verify that the static highest value no longer overlaps other titles; add or update a focused regression test if the project has one for this behavior.

Written by the indexing model from the issue text.