remove LDA_C_PW from p86

parser/parser-quantum-espresso/QuantumEspressoXC.py

@@ -795,6 +795,9 @@ CORRELATION_GRADIENT_CORRECTION = [
         'xc_terms': [{
             'XC_functional_name': "GGA_C_P86",
         }],
+        'xc_terms_subtract': [{
+            'XC_functional_name': 'LDA_C_PW',
+        }],
         'xc_section_method': {
             'x_qe_xc_igcc_name':       "p86",
             'x_qe_xc_igcc_comment':    "Perdew86",

test/xc_functionals/refactor_test/testuite-xc.ref.log

@@ -131,9 +131,6 @@ qe_xc: 0.00 OPTBK88 ( 1  4 23  1 0 0)
   },
   {
     "XC_functional_name": "GGA_X_OPTB88_VDW"
-  },
-  {
-    "XC_functional_name": "LDA_C_PW"
   }
 ]
 qe_xc: 0.00 VDW-DF2 ( 0 413 0 2)