LibWeb/WebGL: Enforce minimum size when resizing existing context

Previously the enforcement was only done on creation. Not enforcing it
on change would cause a crash if the canvas width/height was set to
zero or less.

Libraries/LibWeb/WebGL/WebGL2RenderingContext.cpp

@@ -129,7 +129,10 @@ Optional<WebGLContextAttributes> WebGL2RenderingContext::get_context_attributes(
 
 void WebGL2RenderingContext::set_size(Gfx::IntSize const& size)
 {
-    context().set_size(size);
+    Gfx::IntSize final_size;
+    final_size.set_width(max(size.width(), 1));
+    final_size.set_height(max(size.height(), 1));
+    context().set_size(final_size);
 }
 
 void WebGL2RenderingContext::reset_to_default_state()

Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp

@@ -146,7 +146,10 @@ Optional<WebGLContextAttributes> WebGLRenderingContext::get_context_attributes()
 
 void WebGLRenderingContext::set_size(Gfx::IntSize const& size)
 {
-    context().set_size(size);
+    Gfx::IntSize final_size;
+    final_size.set_width(max(size.width(), 1));
+    final_size.set_height(max(size.height(), 1));
+    context().set_size(final_size);
 }
 
 void WebGLRenderingContext::reset_to_default_state()