Currently the user has to select `SPC c F` for lsp format. But if
lsp-mode is enabled, the user will always want to use the LSP formatter.
So this changes the default `SPC c f` to use lsp formatter if available.
This simplifies the interface a bit so the user doesn't have to worry
about selecting the "right" format, just like how other commands get
auto bound to LSP functions.
300bc65918