LibGfx: Remove Font::presentation_size()

This was a legacy version of point_size() that returned a u8.

Userland/Libraries/LibGfx/Font/Font.h

@@ -150,7 +150,6 @@ public:
 
     virtual FontPixelMetrics pixel_metrics() const = 0;
 
-    virtual u8 presentation_size() const = 0;
     virtual u8 slope() const = 0;
 
     // Font point size (distance between ascender and descender).

Userland/Libraries/LibGfx/Font/ScaledFont.h

@@ -33,7 +33,6 @@ public:
     // ^Gfx::Font
     virtual NonnullRefPtr<Font> clone() const override { return MUST(try_clone()); } // FIXME: clone() should not need to be implemented
     virtual ErrorOr<NonnullRefPtr<Font>> try_clone() const override { return const_cast<ScaledFont&>(*this); }
-    virtual u8 presentation_size() const override { return m_point_height; }
     virtual float point_size() const override;
     virtual float pixel_size() const override;
     virtual int pixel_size_rounded_up() const override;

Userland/Libraries/LibWeb/CSS/MediaQuery.cpp

@@ -169,7 +169,7 @@ bool MediaFeature::compare(HTML::Window const& window, MediaFeatureValue left, C
 
             auto const& initial_font = window.associated_document().style_computer().initial_font();
             Gfx::FontPixelMetrics const& initial_font_metrics = initial_font.pixel_metrics();
-            Length::FontMetrics font_metrics { initial_font.presentation_size(), initial_font_metrics };
+            Length::FontMetrics font_metrics { CSSPixels { initial_font.point_size() }, initial_font_metrics };
 
             left_px = left.length().to_px(viewport_rect, font_metrics, font_metrics);
             right_px = right.length().to_px(viewport_rect, font_metrics, font_metrics);