Update sidebar icons

[danirabbit]

What Happened?

Calculator uses the old non-fd.o pane-show-symbolic and pane-hide-symbolic icons

Steps to Reproduce

https://github.com/elementary/calculator/blob/c20e967965896b56567a489a45f529f4054c0673/src/MainWindow.vala#L93

Expected Behavior

These should be replaced with view-sidebar-end-symbolic which is now in Granite

OS Version

8.x (Circe)

OS Architecture

amd64 (on most hardwares)

Session Type

Secure Session (Wayland)

Software Version

Latest release (I have run all updates)

Log Output

Hardware Info

No response