Repair any doubly declared vars

In case of helper.py it won't affect performance as previous is just overwritten
In case of scrollbar.py it seems unintended has been adjusted

TermTk/TTkCore/helper.py

@@ -59,11 +59,12 @@ class TTkHelper:
     def addShortcut(widget, letter):
         TTkHelper._shortcut.append(TTkHelper._Shortcut(letter, widget))
 
-    @staticmethod
-    def isParent(parent, widget):
-        if parent==widget: return True
-        if widget.parentWidget() is None: return False
-        return TTkHelper.isParent(parent,widget.parentWidget())
+    # redefined on line 306
+    # @staticmethod
+    # def isParent(parent, widget):
+    #     if parent==widget: return True
+    #     if widget.parentWidget() is None: return False
+    #     return TTkHelper.isParent(parent,widget.parentWidget())
 
     @staticmethod
     def execShortcut(letter, widget=None):

TermTk/TTkWidgets/scrollbar.py

@@ -218,7 +218,7 @@ class TTkScrollBar(TTkWidget):
 
     @property
     def maximum(self): return self._maximum
-    @minimum.setter
+    @maximum.setter
     def maximum(self, v):
         if v == self._maximum:
             return