PixelPaint: Don't allow creating empty layers or images

Userland/Applications/PixelPaint/CreateNewImageDialog.cpp

@@ -64,8 +64,8 @@ CreateNewImageDialog::CreateNewImageDialog(GUI::Window* parent_window)
         m_image_size.set_height(value);
     };
 
-    width_spinbox.set_range(0, 16384);
-    height_spinbox.set_range(0, 16384);
+    width_spinbox.set_range(1, 16384);
+    height_spinbox.set_range(1, 16384);
 }
 
 }

Userland/Applications/PixelPaint/CreateNewLayerDialog.cpp

@@ -65,8 +65,8 @@ CreateNewLayerDialog::CreateNewLayerDialog(Gfx::IntSize const& suggested_size, G
         m_layer_size.set_height(value);
     };
 
-    width_spinbox.set_range(0, 16384);
-    height_spinbox.set_range(0, 16384);
+    width_spinbox.set_range(1, 16384);
+    height_spinbox.set_range(1, 16384);
 
     width_spinbox.set_value(suggested_size.width());
     height_spinbox.set_value(suggested_size.height());