misc/freebsd-doc-ja: unbreak after r521437

> ja-freebsd-doc-53688,1 depends on file: /usr/local/share/fonts/OTF/ipam.otf - not found

> Installing existing package /packages/All/ja-font-ipa-00303_7.txz

Installing ja-font-ipa-00303_7...
Extracting ja-font-ipa-00303_7: .......... done

> ja-freebsd-doc-53688,1 depends on file: /usr/local/share/fonts/OTF/ipam.otf - not found

• Error code 1

Reported by: pkg-fallout