Remove unused conserve_memory parameter from blackmanharris_decomp

[Copilot]

Addresses review feedback on #339 to remove the unused conserve_memory parameter from blackmanharris_decomp.pro.

Changes

• Removed conserve_memory keyword parameter from blackmanharris_decomp function signature
• The parameter was declared but never referenced in the function body
• gaussian_decomp continues to use this parameter; calling code in beam_decomp.pro remains unchanged as IDL ignores unrecognized keywords

FUNCTION blackmanharris_decomp, x, y, p, $
  ftransform=ftransform, model_npix=model_npix, model_res=model_res, over_res=over_res,$
- volume_beam=volume_beam, sq_volume_beam=sq_volume_beam, max_amp=max_amp, $
- conserve_memory=conserve_memory
+ volume_beam=volume_beam, sq_volume_beam=sq_volume_beam, max_amp=max_amp

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