EAMxx: fix name of proc step tendency field

Author: bartgol

components/eamxx/src/share/atm_process/atmosphere_process.cpp

@@ -264,7 +264,9 @@ void AtmosphereProcess::setup_step_tendencies () {
 
     auto f = gn=="UNSET" ? get_field_out(fn) : get_field_out(fn,gn);
 
-    const auto& tname = this->name() + "_" + tn + "_tend";
+    const auto& tname = this->name() + "_" +
+                        fn + (gn=="UNSET" ? "" : "_" + gn) +
+                        "_tend";
 
     // Create tend and start-of-step fields
     auto& tend = m_proc_tendencies[fn] = f.clone(tname);