PDFBOX-5487: Remove all space characters if contained within the adjacent letters

[noureldin-eg]

Please see PDFBOX-5487 and the comments below.

In the PDF attached in the Jira issue, there are 2 space characters which overlap with the adjacent letters of 2 Arabic words. When sorting is enabled, this space gets shifted into the middle of a word.

This commit will remove such spaces just after sorting.