[bug] ask_format() eats a line

[benlubas]

When formatting code in a markdown cell with the Lua language server like:

```lua
print( "this should be formatted")
```

The result is:

```lua
print("this should be formatted")

I also see this in norg files where the @end that delimits the end of a code cell is removed.

[jmbuhr]

Indeed, looks like the range of the returned formatting response includes the next line as well:

{                                                                                                                          
  newText = 'print("this should be formatted")\n',                                                                         
  range = {                                                                                                                
    ["end"] = {                                                                                                            
      character = 0,                                                                                                       
      line = 11                                                                                                            
    },                                                                                                                     
    start = {                                                                                                              
      character = 0,                                                                                                       
      line = 9                                                                                                             
    }                                                                                                                      
  }                                                                                                                        
}

The root cause is that the treesitter node that contains the code chunk content appears to always include the next line as well, e.g.
(code_fence_content ; [10:1 - 11:0] markdown for a one-line chunk.

[jmbuhr]

The above linked commit / PR fixes this by simply decrementing the end_row of the node range and I have not encountered any issues so far.