Use the correct theme-agnostic colors for flat buttons

Author: Tyrrrz

LightBulb/Views/Dialogs/SettingsView.axaml

@@ -31,7 +31,7 @@
                                 Padding="8"
                                 Command="{Binding $parent[UserControl].DataContext.ActivateTabCommand}"
                                 CommandParameter="{Binding}"
-                                Foreground="{DynamicResource MaterialPrimaryForegroundBrush}"
+                                Foreground="{DynamicResource MaterialDarkForegroundBrush}"
                                 Theme="{DynamicResource MaterialFlatButton}"
                                 ToolTip.Tip="{Binding DisplayName}">
                                 <materialIcons:MaterialIcon

LightBulb/Views/MainView.axaml

@@ -87,7 +87,7 @@
                             Padding="4"
                             VerticalAlignment="Center"
                             Click="HideButton_OnClick"
-                            Foreground="{DynamicResource MaterialPrimaryMidForegroundBrush}"
+                            Foreground="{DynamicResource MaterialDarkForegroundBrush}"
                             Theme="{DynamicResource MaterialFlatButton}"
                             ToolTip.Tip="Hide LightBulb to the system tray">
                             <materialIcons:MaterialIcon