[3.8] bpo-40431: Fix syntax typo in turtledemo (GH-19777) (#19784)

[3.8] bpo-40431: Fix syntax typo in turtledemo (GH-19777)

* Addresses a syntax typo that mistakenly used a undefined string prefix due to a missing space.

(cherry picked from commit 49f70db)

Co-authored-by: Miro Hrončok <[email protected]>

Author: aeros

Lib/turtledemo/__main__.py

@@ -272,7 +272,7 @@ def configGUI(self, start, stop, clear, txt="", color="blue"):
         self.stop_btn.config(state=stop,
                              bg="#d00" if stop == NORMAL else "#fca")
         self.clear_btn.config(state=clear,
-                              bg="#d00" if clear == NORMAL else"#fca")
+                              bg="#d00" if clear == NORMAL else "#fca")
         self.output_lbl.config(text=txt, fg=color)
 
     def makeLoadDemoMenu(self, master):