LibGfx: Remove unused Font::point_size()

Userland/Libraries/LibGfx/Font/BitmapFont.h

@@ -43,7 +43,6 @@ public:
     void set_presentation_size(u8 size) { m_presentation_size = size; }
 
     virtual float pixel_size() const override { return m_glyph_height; }
-    virtual float point_size() const override { return static_cast<float>(m_glyph_height) * 0.75f; }
 
     u16 weight() const override { return m_weight; }
     void set_weight(u16 weight) { m_weight = weight; }

Userland/Libraries/LibGfx/Font/Font.h

@@ -142,7 +142,6 @@ public:
 
     virtual u8 presentation_size() const = 0;
     virtual float pixel_size() const = 0;
-    virtual float point_size() const = 0;
     virtual u8 slope() const = 0;
 
     virtual u16 weight() const = 0;

Userland/Libraries/LibGfx/Font/ScaledFont.h

@@ -44,7 +44,6 @@ public:
     virtual ErrorOr<NonnullRefPtr<Font>> try_clone() const override { return *this; }
     virtual u8 presentation_size() const override { return m_point_height; }
     virtual float pixel_size() const override { return m_point_height * 1.33333333f; }
-    virtual float point_size() const override { return m_point_height; }
     virtual Gfx::FontPixelMetrics pixel_metrics() const override;
     virtual u8 slope() const override { return m_font->slope(); }
     virtual u16 weight() const override { return m_font->weight(); }