Fix Mojo solution_1 build (meta sieve_size name collision)

[relmer]

Description

This fixes issue #1027 where solution_1 fails during the Docker build step with:

error: invalid redefinition of 'sieve_size'

Root cause
The meta sieve types declare a compile-time generic parameter named sieve_size (e.g. prime_sieve_1bit_meta[sieve_size: Int]) and also used sieve_size as the runtime parameter name in __call__. Newer Mojo treats that as a redeclaration in the same scope.

Fix
Rename the __call__ runtime parameter in the meta types to avoid colliding with the generic parameter.

Verification
docker build -t mojosieve . and docker run --rm -it mojosieve succeed again.

Fixes #1027

Contributing requirements

• I read the contribution guidelines in CONTRIBUTING.md.
• I placed my solution in the correct solution folder.
• I added a README.md with the right badge(s).
• I added a Dockerfile that builds and runs my solution.
• I selected drag-race as the target branch.
• All code herein is licensed compatible with BSD-3.

[rbergen]

@relmer Thank you so much for submitting this! I've taken the liberty of reenabling CI and benchmark builds for Mojo/solution_1, and I can confirm CI succeeds once again.

So, LGTM!