Removed unused field in form

[ethantkoenig]

Remove unused OldTitle field from NewWikiForm. The wiki's old title is inferred from the :page parameter in the URL.

[codecov-io]

Codecov Report

Merging #3023 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3023      +/-   ##
==========================================
- Coverage   33.03%   32.98%   -0.05%     
==========================================
  Files         270      270              
  Lines       39534    39534              
==========================================
- Hits        13061    13042      -19     
- Misses      24617    24637      +20     
+ Partials     1856     1855       -1

Impacted Files	Coverage Δ
modules/auth/repo_form.go	32.87% <ø> (ø)	⬆️
models/repo_indexer.go	45.54% <0%> (-6.44%)	⬇️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
modules/indexer/repo.go	60.86% <0%> (-2.61%)	⬇️

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[lunny]

LGTM

[appleboy]

LGTM