Set CursorLineNr backgroud to be the same as LineNr

Having a different background for the line cursor looks weird for me. changing:
```
hi CursorLineNr guifg=#3a4d53 guibg=NONE guisp=NONE gui=NONE cterm=NONE
```
to
```
hi CursorLineNr guifg=#3a4d53 guibg=#e9e4d0 guisp=NONE gui=NONE cterm=NONE
```
would resolve the problem.