File rename cause file overwrite (missing same name verification)

[Tomi2965]

In short: renaming file to same name as existing file will cause overwrite of existing file.

Required files for reproduction (example):

• file "1.txt" with content "Test: 1"
• file "2.txt" with content "Test: 2"

Reproduction:
1.) open qFlipper
2.) upload two files - 1.txt and 2.txt
3.) rename 2.txt to 1.txt
4.) old file 1.txt will disappear (or it's overwritten?)
5.) for verification download file "1.txt" - you will see content "Test: 2", not "Test: 1"

Version info:
Win10 - Latest updates
qFlipper ver 1.3.3
FZ ver 0.95.0