[BUG] Paste pictures Ctrl+V always at the end #489

For Bug Reports

BookStack: v0.17.1 to v0.17.4
PHP: PHP 7.0.22-0ubuntu0.16.04.1
MySQL: 5.7.19-0ubuntu0.16.04.1 (Ubuntu)
OS: 4.4.0-87-generic #110-Ubuntu x86_64 x86_64 x86_64 GNU/Linux:

Expected Behavior

If I paste pictures with CTRl+V I expect them to be pasted at the location where my mouse course is.

Actual Behavior

However the pictures I paste appear at the very end of my editing window.