Fix `net_send` from NET_RECEIVE block.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 15.38462% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 86.25%. Comparing base (0edbed9) to head (cdff628).

Files	Patch %	Lines
src/codegen/codegen_neuron_cpp_visitor.cpp	15.38%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1276 +/- ## ========================================== - Coverage 86.29% 86.25% -0.05% ========================================== Files 178 178 Lines 13267 13276 +9 ========================================== + Hits 11449 11451 +2 - Misses 1818 1825 +7 ```

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[bbpbuildbot]

Logfiles from GitLab pipeline #212659 (:white_check_mark:) have been uploaded here!

Status and direct links:

• :white_check_mark: spack_setup
• :white_check_mark: build:intel
• :white_check_mark: build:nvhpc
• :white_check_mark: test:intel
• :white_check_mark: test:nvhpc