fix the width of the blur effect

Author: jjw24

Flow.Launcher/Themes/BlurBlack.xaml

@@ -21,6 +21,7 @@
     </Style>
 
     <Style x:Key="WindowStyle" BasedOn="{StaticResource BaseWindowStyle}" TargetType="{x:Type Window}">
+        <Setter Property="Width" Value="750" /> <!-- This is used to set the blur width only -->
         <Setter Property="Background">
             <Setter.Value>
                 <SolidColorBrush Color="Black" Opacity="0.3"/>

Flow.Launcher/Themes/BlurWhite.xaml

@@ -21,6 +21,7 @@
     </Style>
 
     <Style x:Key="WindowStyle" BasedOn="{StaticResource BaseWindowStyle}" TargetType="{x:Type Window}">
+        <Setter Property="Width" Value="750" /> <!-- This is used to set the blur width only -->
         <Setter Property="Background">
             <Setter.Value>
                 <SolidColorBrush Color="White" Opacity="0.1"/>