main: fix pyflakes warning.

pep8 wants the functions written as defs, not lambdas, but pyflakes
complains if we redefine the same function.  Change the code to define
two functions and use a ternary expression to select the one we want.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

lib/newfol/main.py

@@ -1137,12 +1137,13 @@ def export_from(db, table, dbtype):
 
     def f(x):
         return True
+
+    def g(x):
+        return x.table == table
     if table is None and dbtype == "csv":
         raise newfol.exception.NewfolError(_("A table is required for csv"))
-    if table is not None:
-        def f(x):
-            x.table == table
-    vault.store(db.records(f))
+    func = f if table is None else g
+    vault.store(db.records(func))
 
 
 def parse_args(args):