Adjust regex in gopls-def for when filepath contains a dash

When calling `:gopls definition`, the gopls LSP server returns the location of
the selected definition. Then, `gopls.kak` tries to parse this output to
feed the `:edit` command and open the file in Kakoune. To do this, it
uses `sed` to transform `<path>.go:<line>:<colstart>-<colend>` to `<path>.go
<line> <colstart>`. However, if the `<path>` contains a dash character,
the `sed` will fail and strip everything after this first dash, removing
the line and columns information.

Closes #4776

rc/tools/go/gopls.kak

@@ -69,7 +69,7 @@ define-command -hidden -params 1 gopls-cmd %{
 define-command -hidden -params 0 gopls-def %{
     evaluate-commands %sh{
         jump=$( gopls definition "${kak_buffile}:${kak_cursor_line}:${kak_cursor_column}" 2> /dev/null \
-            |sed -e 's/-.*//; s/:/ /g; q' )
+            |sed -e 's/-[0-9]\+:.*//; s/:/ /g; q' )
         if [ -n "${jump}" ]; then
             printf %s\\n "evaluate-commands -try-client '${kak_opt_jumpclient}' %{
                 edit ${jump}