GUI: NumberInput small improvements #3840

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Task	Status
I really liked the idea of a number input and already had a use for it, but found a detail that did not fit my use case:
When showing NumberInput, there is always a number there
You can set current number to 0, but then if you want to have a minimum value, current number is changed to minimum value, so user gets default text of the minimum value and they need to erase this then input their number
My use case would work better where you can start typing, and the save button is enabled when the number is within bounds	Incomplete
This PR allows passing 0 as current number, which will mean the input is empty by default	Incomplete
Also, manually pressing 0 when input is empty shows the number 0 instead of doing nothing, to avoid confusion	Incomplete
Also aligned the input bar to keyboard bar, it was probably misaligned due to taking the skeleton of ByteInput, which has arrows on sides of input bar	Incomplete
Set number to zero	Incomplete
Click change again, input is empty due to current number being 0	Incomplete
Click 0 when input is empty, 0 is displayed	Incomplete
Check that input bar is vertically aligned to keyboard buttons	Incomplete
PR has description of feature/bug or link to Confluence/Jira task	Incomplete
Description contains actions to verify feature/bugfix	Incomplete
I've built this code, uploaded it to the device and verified feature/bugfix	Incomplete