Fix implicit arguments indexed product.

modures/cmra.v

@@ -572,4 +572,4 @@ Section iprod_cmra.
     CMRAT iprod_cofe_mixin iprod_cmra_mixin iprod_cmra_extend_mixin.
 End iprod_cmra.
 
-Arguments iprodRA : clear implicits.
+Arguments iprodRA {_} _.

modures/cofe.v

@@ -399,4 +399,4 @@ Section iprod_cofe.
   Canonical Structure iprodC : cofeT := CofeT iprod_cofe_mixin.
 End iprod_cofe.
 
-Arguments iprodC : clear implicits.
+Arguments iprodC {_} _.