Correctly consider the heavy bonds and hydrogen counts. When connectedHeavyAtoms == 2 the full bond list was checked for the aromatic bonds. As the full bond list could contain an explicit hydrogen we should filter it to ensure the aromatic bond checking works correctly.

Change-Id: Ie9952a4da175996acf6f7bf4af5d93aa7c95cc5d
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>