fix: remove duplicate context->layoutDimensions init

[jsbrucker]

Summary

Removing a redundant property initialization, layoutDimensions was already set to the same value on line 4054.

Validation

I have run cmake . followed by make locally and confirmed everything builds with no new warnings. The only existing warning is:

[  0%] Building C object examples/clay-official-website/CMakeFiles/clay_official_website.dir/main.c.o
~/dev/clay/examples/clay-official-website/main.c: In function ‘HandleRendererButtonInteraction’:
~/dev/clay/examples/clay-official-website/main.c:237:33: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  237 |         ACTIVE_RENDERER_INDEX = (uint32_t)userData;
      |                                 ^

As a low effort sanity check, I have also run ./examples/terminal-example/clay_examples_terminal with and without the change to see that there are no obvious differences.
Please provide guidance if there is some test command I can/should be running, I didn't see any but I don't normally use cmake so it is likely I missed something.

[jsbrucker]

Note: Here is where layoutDimensions was already set.