Fix line number display for LSP goto pickers (#6559)

Line numbers are 0-indexed in the LSP spec but 1-indexed for display
and jumping purposes in Helix.

helix-term/src/commands/lsp.rs

@@ -81,7 +81,7 @@ fn format(&self, cwdir: &Self::Data) -> Row {
 
         // Most commonly, this will not allocate, especially on Unix systems where the root prefix
         // is a simple `/` and not `C:\` (with whatever drive letter)
-        write!(&mut res, ":{}", self.range.start.line)
+        write!(&mut res, ":{}", self.range.start.line + 1)
             .expect("Will only failed if allocating fail");
         res.into()
     }