Fix bug counting whitespace passwords

[atoponce]

There are 22 characters of different byte sizes:

• " ": U+0020 (1 byte)
• "᠎": U+180E (3 bytes)
• " ": U+2000 (3 bytes)
• " ": U+2001 (3 bytes)
• " ": U+2002 (3 bytes)
• " ": U+2003 (3 bytes)
• " ": U+2004 (3 bytes)
• " ": U+2005 (3 bytes)
• " ": U+2006 (3 bytes)
• " ": U+2007 (3 bytes)
• " ": U+2008 (3 bytes)
• " ": U+2009 (3 bytes)
• " ": U+200A (3 bytes)
• "​": U+200B (3 bytes)
• "‌": U+200C (3 bytes)
• "‍": U+200D (3 bytes)
• " ": U+202F (3 bytes)
• "⁠": U+2060 (3 bytes)
• "　": U+3000 (3 bytes)
• "": U+FEFF (3 bytes)
• "󠀠": U+E0020 (4 bytes)

At 22 unique whitespace characters, that's log2(22) ~= 4.459 bits per character. That means we should expect these character counts for the following minimum security levels:

• 56 bits: 13 characters
• 64 bits: 15 characters
• 72 bits: 17 characters
• 80 bits: 18 characters
• 88 bits: 20 characters
• 96 bits: 22 characters
• 104 bits: 24 characters
• 112 bits: 26 characters
• 120 bits: 27 characters
• 128 bits: 29 characters