Fixing gap in logic where query was triggering when programatically setting text.

Updating the binding and settext both will trigger the TextChanged event on a seperate event dispatcher.  For this reason we dynamically detect which eventhandler is most approapriate on the textchanging event.

src/modules/launcher/PowerLauncher.UI/LauncherControl.xaml

@@ -375,7 +375,6 @@
             x:FieldModifier="public"
             Style="{StaticResource CustomAutoSuggestBoxTextBoxStyle}"
             PlaceholderText="Start typing"
-            Text="{Binding QueryText}"
             Height="60"
             ScrollViewer.BringIntoViewOnFocusChange="False"
             Canvas.ZIndex="0"