[EDB Package Functions] [Functions] Fixed typos:

- 'gettext' should be used as '_' is not defined
    - Identical expressions should not be used on both sides of a binary operator.

web/pgadmin/browser/server_groups/servers/databases/schemas/packages/edbfuncs/__init__.py

@@ -283,7 +283,7 @@ class EdbFuncView(PGChildNodeView, DataTypeReader):
         if edbfnid is not None:
             if len(rset['rows']) == 0:
                 return gone(
-                    errormsg=_("Could not find the function")
+                    errormsg=gettext("Could not find the function")
                 )
             row = rset['rows'][0]
             return make_json_response(
@@ -479,7 +479,7 @@ class EdbFuncView(PGChildNodeView, DataTypeReader):
 
         arg = ''
 
-        if argmode and argmode:
+        if argmode:
             arg += argmode + " "
         if argname:
             arg += argname + " "