show: Fix bug with multi-line discussion comment output

Currently when outputting a multi-line comment in a discussion the output
looks like

    prarit commented at 2020-09-25 15:47:37.445 +0000 UTC

    The
quick
brown
fox
jumps

When it should be

    prarit commented at 2020-09-25 15:47:37.445 +0000 UTC

    The
    quick
    brown
    fox
    jumps

This occurs because only the first line the note Body is "tabbed" over.
Each newline should be tabbed over as well.

Fix bug with multi-line discussion comment output.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>

cmd/issue_show.go

@@ -163,6 +163,8 @@ func PrintDiscussions(discussions []*gitlab.Discussion, since string, idstr stri
 					indentHeader = "    "
 				}
 			}
+
+			noteBody := strings.Replace(note.Body, "\n", "\n"+indentHeader, -1)
 			printit := color.New().PrintfFunc()
 			printit(`
 %s-----------------------------------`, indentHeader)
@@ -176,7 +178,7 @@ func PrintDiscussions(discussions []*gitlab.Discussion, since string, idstr stri
 %s%s
 `,
 				indentHeader, note.ID, note.Author.Username, commented, time.Time(*note.UpdatedAt).String(),
-				indentNote, note.Body)
+				indentNote, noteBody)
 		}
 	}