Remove tag duplicates
Prevention of getting this error:
```
ActiveRecord::RecordNotUnique: PG::Error: ERROR: could not create unique index "index_tags_on_name"
DETAIL: Key (name)=(XSS') is duplicated.
: CREATE UNIQUE INDEX "index_tags_on_name" ON "tags" ("name")
```
This migration fails if there are duplicates:
https://github.com/mbleigh/acts-as-taggable-on/blob/v3.5.0/db/migrate/2_add_missing_unique_indices.rb#L3
See merge request !623
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| .. | ||
| fixtures | ||
| migrate | ||
| schema.rb | ||
| seeds.rb | ||