fix(protocols): four more maker-side guards still say 'invalid format' #2406

Is your feature request related to a problem? Please describe.

#2296 (fixed by #2405) replaced the reader's generic "invalid format" text on several _make_* builders with messages naming the rejected argument. Four more maker-side sites have the same defect but weren't in that issue's checklist, found during #2405's cross-review:

• HOPOPT._make_opt_pad (pcapkit/protocols/internet/hopopt.py)
• IPv6_Opts._make_opt_pad (pcapkit/protocols/internet/ipv6_opts.py)
• HTTP.make (pcapkit/protocols/application/httpv2.py)
• PCAPNG.make (pcapkit/protocols/misc/pcapng.py, the dispatcher make, not _make_block_dsb which fix(protocols): makers name the rejected argument and value in error messages #2405 already fixed)

Describe the solution you'd like

Same convention as #2405: name the argument and the value/requirement instead of the generic reader-style text. The two _make_opt_pad sites are twins of MH._make_opt_pad's fix in #2405 and can likely reuse its wording.