Update subkey details dialog columns

• Add Fingerprint column
• Remove "Type"
• Replace "Strength" with "Algorithm", combining "Type" and "Strength" as in the key list
• Remove "Primary", as this is always the first key

(cherry picked from commit 2d08050482432bba6786c91eb067dc401759212a)

• GnuPG-Bug-ID: T6959