iop/lens: pass right parameters to method commit_params

[sgotti]

Params can be reset to defaults inside the main commit_params but on specific method commit_param[lf|md] call the source one were passed.

Should really fix #12758

[TurboGit]

Please help me... The code I see seems to be fully equivalent... So it should change nothing, no?

[sgotti]

@TurboGit it's tricky and I missed it after looking at it many times...

in commit_params if p->modified == 0 the p pointer is set to self->default_params,

darktable/src/iop/lens.cc

Lines 1966 to 1973 in 64a61e5

	if(p->modified == 0)
	{
	/*
	* user did not modify anything in gui after autodetection - let's
	* use current default_params as params - for presets and mass-export
	*/
	p = (dt_iop_lens_params_t *)self->default_params;
	}

but before this PR the source p1 instead of p was passed to _commit_params_[lf|md].

[TurboGit]

@TurboGit it's tricky and I missed it after looking at it many times...

I see, p is set again to point to the default params. Indeed, not clear at first sight :) Thanks.

[TurboGit]

Thanks!