Remove duplicate button_ok code in idlelib.textview (GH-153733)

(cherry picked from commit c5530cc)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Author: terryjreedy

Lib/idlelib/textview.py

@@ -92,10 +92,10 @@ def __init__(self, parent, contents, wrap='word'):
         color_config(text)
         text.focus_set()
 
-        self.button_ok = button_ok = Button(
+        self.button_ok = Button(
                 self, text='Close', command=self.ok, takefocus=False)
         self.textframe.pack(side='top', expand=True, fill='both')
-        button_ok.pack(side='bottom')
+        self.button_ok.pack(side='bottom')
 
     def ok(self, event=None):
         """Dismiss text viewer dialog."""
@@ -127,10 +127,8 @@ def __init__(self, parent, title, contents, modal=True, wrap=WORD,
         self.geometry(f'=750x500+{x}+{y}')
 
         self.title(title)
-        self.viewframe = ViewFrame(self, contents, wrap=wrap)
         self.protocol("WM_DELETE_WINDOW", self.ok)
-        self.button_ok = Button(self, text='Close',
-                                command=self.ok, takefocus=False)
+        self.viewframe = ViewFrame(self, contents, wrap=wrap)
         self.viewframe.pack(side='top', expand=True, fill='both')
 
         self.is_modal = modal