Bugfix - in numericise do to overwirte original value
Bugfix - in numericise do to overwirte original value

In numericise if the given value has a comma `,`, when trying
to convert it to a number do not overwrite the original
with the new string without comma, if it is not a number
we lost the original string with the comma inside.

Signed-off-by: Alexandre Lavigne <74b357371b721698434ec0643e6a62bbef389d49@gmail.com>

burnash/gspread