LibWeb/WebGL: Implement WebGLRenderingContextBase.lineWidth()

Author: https://github.com/Lubrsi
Commit: d9ef228c76
Pull-request: https://github.com/SerenityOS/serenity/pull/14184
Reviewed-by: https://github.com/Quaker762 ✅
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/linusg ✅
Reviewed-by: https://github.com/sunverwerth

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h

@@ -48,6 +48,7 @@ public:
 
     GLenum get_error();
 
+    void line_width(GLfloat width);
     void polygon_offset(GLfloat factor, GLfloat units);
 
     void scissor(GLint x, GLint y, GLsizei width, GLsizei height);