Unable to change default name in SAVE RAW

**Describe the bug**
Unable to rename raw filename.

**To Reproduce**
Steps to reproduce the behavior:
1. Save some raw signal
2. Try to change defualt name
3. See error with sd-card icon (cant rename)
4. Thats it.

**Expected behavior**
Saving with changed name as it should be.

**Target**
F7

**Additional context**
In my unleashed fork I will try make temp solution for it.
