Incorrect folding range when a function with an inline comment follows an annotation

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### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Formatting

### Expected Behaviour

The folding chevron will be next to the function declaration and will fold the function.

### Actual Behaviour

The folding chevron is next to the annotation and will only fold the one line of the function, leaving the rest of the function unfolded.


### Reproduction steps

This code reproduces it:
`
---@param bar integer
function foo(bar) -- comment
local whee = bar + 3
return whee
end
`

### Additional Notes

Removing the inline comment fixes it.
Putting a blank line between the annotation and the function declaration line, even if it still has the inline comment, fixes it.


### Log File

I couldn't get the thing to upload it, I'm sorry :(

Start by reproducing the folding behavior with the Lua snippet in the issue, comparing it with the variants that remove the inline comment or add a blank line. Trace the folding-range handling for an annotation followed by a function declaration. Done means the folding chevron is beside the function declaration and folds the entire function body.

Written by the indexing model from the issue text.