Code Quality: Follow up for group header alignment

Author: yaira2

src/Files.App/Views/Layouts/ColumnLayoutPage.xaml

@@ -359,7 +359,7 @@
 								<DataTemplate x:DataType="storage:IGroupedCollectionHeader">
 									<StackPanel
 										Margin="0,0,0,4"
-										VerticalAlignment="Center"
+										VerticalAlignment="Bottom"
 										AutomationProperties.Name="{x:Bind Model.Text}"
 										Spacing="0">
 

src/Files.App/Views/Layouts/DetailsLayoutPage.xaml

@@ -1392,7 +1392,7 @@
 								<DataTemplate x:DataType="storage:IGroupedCollectionHeader">
 									<StackPanel
 										Margin="0,0,0,4"
-										VerticalAlignment="Center"
+										VerticalAlignment="Bottom"
 										AutomationProperties.Name="{x:Bind Model.Text}"
 										Spacing="0">
 										<StackPanel Orientation="Horizontal" Spacing="4">

src/Files.App/Views/Layouts/GridLayoutPage.xaml

@@ -1042,7 +1042,7 @@
 								<DataTemplate x:DataType="storage:IGroupedCollectionHeader">
 									<Grid
 										Padding="0,0,0,4"
-										VerticalAlignment="Center"
+										VerticalAlignment="Bottom"
 										AutomationProperties.Name="{x:Bind Model.Text}"
 										ColumnSpacing="8"
 										RowSpacing="8">