[utils] render_table: Fix character calculation for removing extra gap

without this fix, the column next to delimiter will lack leading spaces on terminal (see https://github.com/yt-dlp/yt-dlp/pull/920#issuecomment-1059914615 for the situation)

yt_dlp/utils.py

@@ -3485,7 +3485,7 @@ def render_table(header_row, data, delim=False, extra_gap=0, hide_empty=False):
     extra_gap += 1
     if delim:
         table = [header_row, [delim * (ml + extra_gap) for ml in max_lens]] + data
-        table[1][-1] = table[1][-1][:-extra_gap]  # Remove extra_gap from end of delimiter
+        table[1][-1] = table[1][-1][:-extra_gap * len(delim)]  # Remove extra_gap from end of delimiter
     for row in table:
         for pos, text in enumerate(map(str, row)):
             if '\t' in text: