[BUG]: Crash when duplicating a filter name. #2220

Brief description of the issue

If you name a filter the same as an existing one, the app crashes.

How to reproduce the bug?

Create a filter named "TEST"
Try to create a second filter named "TEST 2"

What was the expected result?

Both filters have been created and named.

What actually happened?

As soon as the second filter is given the same name as the first one, it crashes.

Debug log

time=" 9.360" type="critical" -> database: SQL exception: 'UNIQUE constraint failed: MessageFilters.name No es posible obtener la fila'.
time=" 9.360" type="critical" -> Unhandled application exception: '2067/UNIQUE constraint failed: MessageFilters.name No es posible obtener la fila [sqlquery.cpp:32]'.

Operating system and version

• OS: Arch linux
• RSS Guard version: 5.0.4 (flathub)