jimage help message for --include option should be corrected

jimage tool doesn't support '@<filename>' and therefore its help message for --include option should be corrected.

==
  --include <pattern-list> Pattern list for filtering entries.

For options requiring a <pattern-list>, the value will be a comma separated list of elements each using one the following forms:
  <glob-pattern>
  glob:<glob-pattern>
  regex:<regex-pattern>
  @<filename> where filename is the name of a file containing patterns to be used, one pattern per line
==

The last line of the help message above should be removed.