• Fix MASTER_SITES to point to the correct version everytime [1]
• Bump to 1.4.7 to reflect the real distinfo version

The version for downloaded file was actually 1.4.7, but VERSION was
mistakenly set to 1.4.6.

PR: ports/178004 [1]
Submitted by: John Marino <draco@marino.st> [1]
Approved by: culot (mentor), maintainer (timeout, > 14 days)