statistics: Fix geometric_mean() error message for negative inputs

The error message was constructed with two positional arguments to
StatisticsError, causing str(e) to display as a tuple:
"('No negative inputs allowed', -2.0)". Use an f-string instead so
the value is embedded directly in the message string.

Author: htjworld

Lib/statistics.py

@@ -248,7 +248,7 @@ def count_positive(iterable):
             elif x == 0.0:
                 found_zero = True
             else:
-                raise StatisticsError('No negative inputs allowed', x)
+                raise StatisticsError(f'No negative inputs allowed: {x!r}')
 
     total = fsum(map(log, count_positive(data)))