LibGUI: Use LightGray as the base UI color.

This feels nicely reminiscent of the gap in time between Win3.11 and Win95,
one of my favorite eras in UI look-and-feel.

LibGUI/GCheckBox.cpp

@@ -65,6 +65,7 @@ void GCheckBox::paint_event(GPaintEvent&)
         2, height() / 2 - s_box_height / 2 - 1,
         s_box_width, s_box_height
     };
+    painter.fill_rect(box_rect, Color::White);
     painter.draw_rect(box_rect, Color::Black);
 
     if (m_being_modified) {

LibGUI/GTextBox.cpp

@@ -8,6 +8,7 @@
 GTextBox::GTextBox(GWidget* parent)
     : GWidget(parent)
 {
+    set_background_color(Color::White);
 }
 
 GTextBox::~GTextBox()

LibGUI/GWidget.cpp

@@ -10,7 +10,7 @@ GWidget::GWidget(GWidget* parent)
     : GObject(parent)
 {
     set_font(nullptr);
-    m_background_color = Color::White;
+    m_background_color = Color::LightGray;
     m_foreground_color = Color::Black;
 }
 

Userland/guitest2.cpp

@@ -33,6 +33,7 @@ private:
 ClockWidget::ClockWidget(GWidget* parent)
     : GWidget(parent)
 {
+    set_font(Font::default_bold_font());
     set_relative_rect({ 0, 0, 100, 40 });
     start_timer(250);
 }
@@ -46,7 +47,7 @@ void ClockWidget::paint_event(GPaintEvent&)
     sprintf(timeBuf, "%02u:%02u:%02u", tm.tm_hour, tm.tm_min, tm.tm_sec);
 
     Painter painter(*this);
-    painter.fill_rect(rect(), Color::White);
+    painter.fill_rect(rect(), Color::LightGray);
     painter.draw_text(rect(), timeBuf, Painter::TextAlignment::Center, Color::Black);
 }