Linux: dynamically adjust the SECATTR column width

SELinux contexts can be quite long; adjust the column width dynamically
at each cycle to the longest value.

Also with the recent addition of multiple screens, over-long columns can
be moved into their own screen.

linux/LinuxProcessList.c

@@ -1029,6 +1029,9 @@ static void LinuxProcessList_readSecattrData(LinuxProcess* process, openat_arg_t
    if (newline) {
       *newline = '\0';
    }
+
+   Process_updateFieldWidth(SECATTR, strlen(buffer));
+
    if (process->secattr && String_eq(process->secattr, buffer)) {
       return;
    }