fix namelist default order

Author: peverwhee

bld/namelist_files/namelist_defaults_cam.xml

@@ -577,9 +577,9 @@
 
 <!-- Pressure top for blending region for radiation heating -->
 <p_top_for_equil_rad>                  0.D0 </p_top_for_equil_rad>
-<p_top_for_equil_rad  rad="rrtmgp">    2.D0 </p_top_for_equil_rad>
 <p_top_for_equil_rad  waccmx="1" >     1.D0 </p_top_for_equil_rad>
 <p_top_for_equil_rad  waccm_phys="1" > 1.D0 </p_top_for_equil_rad>
+<p_top_for_equil_rad  rad="rrtmgp">    2.D0 </p_top_for_equil_rad>
 
 <!-- CAM-RT absorptivity/emissivity lookup table -->
 <absems_data rad="camrt">atm/cam/rad/abs_ems_factors_fastvx.c030508.nc</absems_data>