efl_ui_format: fix to display %% and unknown format element
This fixes 2 things as follows.
- Displays format string "%%" as "%". Like printf does, "%%" is displayed as "%".
- Displays unknown format element as it is. In format string "(50%)", ")" is an unknown format element. Although format string has unknown format element, the format string is displayed like printf does.
The cause of the issue displaying "0%" which was mentioned on
a96933f964b1757b9d9f8a4cce14d883f35a6665 is as follows.
The default format string of progressbar is set as "%.0f%%".
Therefore, if progressbar's format string is not set, then "%" postfix
is always displayed.
This commit reverts commit a96933f964b1757b9d9f8a4cce14d883f35a6665.
This commit restores commit b4112b9735ce75bce95974a257aa1880fa52a6bf.
This commit restores commit be770d37fb05b8486907796dd16f4635bceb4ce1.
Reviewed-by: Cedric BAIL <firstname.lastname@example.org>
Differential Revision: https://phab.enlightenment.org/D7856