Fix listing breakpoints with go/delve

[cryptomilk]

E5108: Error executing lua:
 ~/.local/share/nvim/lazy/nvim-dap/lua/dap/breakpoints.lua:187: invalid
 value (boolean) at index 2 in table for 'concat'
stack traceback:
   [C]: in function 'concat'
   ~/.local/share/nvim/lazy/nvim-dap/lua/dap/breakpoints.lua:187: in function 'to_qf_list'
   ~/.local/share/nvim/lazy/nvim-dap/lua/dap.lua:723: in function 'list_breakpoints'
   ...azy/telescope-dap.nvim/lua/telescope/_extensions/dap.lua:115: in function 'list_breakpoints'
   ~/.config/nvim/lua/plugins/dap/init.lua:76: in function <~/.config/nvim/lua/plugins/dap/init.lua:75>

[mfussenegger]

Thanks