feat: show TaskEditing window centered on screen. This is homogeneous with the creation window.

Author: Xiphereal

Desktop/Tasks/TaskEditing.xaml

@@ -4,7 +4,8 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         mc:Ignorable="d"
-        Title="TaskEditing" Height="250" Width="400">
+        Title="TaskEditing" Height="250" Width="400"
+        WindowStartupLocation="CenterScreen">
     <Grid Margin="{StaticResource DefaultMargin}">
         <StackPanel>
             <Label Content="_Name:" Target="{Binding ElementName=Name}" />