Remove a redundant comma

The comma doesn't have any effect, but triggers a lint warning: Expression value is unused.

(`a,` means the tuple `(a,)`)

Author: YDX-2147483647

lib/matplotlib/scale.py

@@ -576,7 +576,7 @@ def set_default_locators_and_formatters(self, axis):
         if self._base > 1:
             axis.set_major_formatter(LogFormatterSciNotation(self._base))
         else:
-            axis.set_major_formatter('{x:.3g}'),
+            axis.set_major_formatter('{x:.3g}')
 
 
 class LogitTransform(Transform):