GGroupBox: Allow constructing these without an initial text.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/974c0f97b8d

Libraries/LibGUI/GGroupBox.cpp

@@ -2,6 +2,11 @@
 #include <LibGUI/GPainter.h>
 #include <SharedGraphics/StylePainter.h>
 
+GGroupBox::GGroupBox(GWidget* parent)
+    : GGroupBox({}, parent)
+{
+}
+
 GGroupBox::GGroupBox(const StringView& title, GWidget* parent)
     : GWidget(parent)
     , m_title(title)

Libraries/LibGUI/GGroupBox.h

@@ -4,6 +4,7 @@
 
 class GGroupBox : public GWidget {
 public:
+    explicit GGroupBox(GWidget* parent);
     GGroupBox(const StringView& title, GWidget* parent);
     virtual ~GGroupBox() override;