fix: testnet datadir could not be created first

lib/simple_config.py

@@ -85,9 +85,7 @@ class SimpleConfig(PrintError):
         if path is None:
             path = self.user_dir()
 
-        if self.get('testnet'):
-            path = os.path.join(path, 'testnet')
-
+        def make_dir(path):
             # Make directory if it does not yet exist.
             if not os.path.exists(path):
                 if os.path.islink(path):
@@ -95,6 +93,11 @@ class SimpleConfig(PrintError):
                 os.mkdir(path)
                 os.chmod(path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
 
+        make_dir(path)
+        if self.get('testnet'):
+            path = os.path.join(path, 'testnet')
+            make_dir(path)
+
         self.print_error("electrum directory", path)
         return path