test/cmdline: silence clang 12 warning

test/cmdline: silence clang 12 warning

clang 12 gives a warning about string concatenation in arrays.
In this case, as it is a long string test the strings are concatenated.
Add parentheses to indicate this.

$ clang --version
clang version 12.0.0 (Fedora 12.0.0-0.3.rc1.fc34)

../app/test/test_cmdline_num.c:204:5: warning:
suspicious concatenation of string literals in an array initialization;
did you mean to separate the elements with a comma?
[-Wstring-concatenation]
"1111000011110000111100001111000011110000111100001111000011110000",
^
../app/test/test_cmdline_num.c:203:3: note:
place parentheses around the string literal to silence warning
"0b1111000011110000111100001111000011110000111100001111000011110000"
^

Signed-off-by: Kevin Traynor <ktraynor@redhat.com>