ls: fix a regression by honoring NORMAL attributes again

ls: fix a regression by honoring NORMAL attributes again

Output the NORMAL attribute before non file name text.
This attribute will continue into file names that would
not otherwise be colored unless FILE is also set.
The regression was introduced with commit 483297d5, 28-02-2009,
"ls --color no longer outputs unnecessary escape sequences".

* src/ls.c (set_normal_color): A new function to output the
NORMAL attribute sequence if it's enabled.
(print_current_files): Output NORMAL before printing long format info.
(print_file_name_and_frills): Output NORMAL before printing file name.
(print_color_indicator): Reset the attributes before a file name with
attributes so that NORMAL attributes will not combine with them.
(print_name_with_quoting): Ensure attributes are reset after printing
the file name if NORMAL attributes were output.
* tests/ls/color-norm: A new test for NORMAL and FILE combinations.
* tests/Makefile.am: Reference the new test.
* NEWS: Mention the fix.
Reported in https://savannah.gnu.org/bugs/?26512