Remove render button on "Year in pixels"

[queze1]

Is your feature request related to a problem? Please describe.
The render button is redundant since rendering only needs to happen when the year is changed or the tab is loaded.

Describe the solution you'd like
Remove the render button and automatically rerender whenever the year is changed.

[someretical]

The render button is there if the user wants to manually change the year. The reason why it is this way is because it's a relatively expensive process to render all the buttons. You can check the source code in src/gui/diarypixels.cpp to see what I mean.

[queze1]

Automatically rendering once the user manually changing the year would be more convenient than manually changing the year and pressing the render button.

[someretical]

The thing is, you can't just switch to a completely different year without pasting the value in directly. So either you paste it in once and it updates, or it just keeps on updating as you change the place values one by one.