Fix uninitialized radial_c pointer in toW90_PW trial orbital setup

Commit 385e5d5 replaced the inline radial_in_q[wannier_index].c
expressions with a radial_c variable but left it self-initialized,
so produce_trial_in_pw dereferenced an indeterminate pointer during
Amn/Mmn trial orbital interpolation and crashed (101_PW_W90 segfault).

Initialize radial_c from radial_in_q[wannier_index].c. Verified by
rebuilding abacus_max_para and rerunning the 101_PW_W90 case with
4 MPI processes: etotref, etotperatomref, CompareAMN, CompareMMN and
CompareEIG all pass; agent_governance_check reports no findings.

Author: abacus_fixer

source/source_io/module_wannier/to_w90_pw_setup.cpp

@@ -129,7 +129,7 @@ void toW90_PW::produce_trial_in_pw(
     std::vector<std::complex<double>> sf(npw);
     for (int wannier_index = 0; wannier_index < num_wannier; wannier_index++)
     {
-        double* radial_c = radial_c;
+        double* radial_c = radial_in_q[wannier_index].c;
         const int nqx = nqx_;
 
         if (L[wannier_index] >= 0)