update pptaunu lines

Some improvements to the pptaunu lines.

• Simplified daughter selections and effectively got rid of merging for simplicity.
• Re-labelled fake protons to now be pions from N(1440)0->p pi for clarity.
• Removed trigger requirements on the bkg lines
• Tightened bkg prescales to keep rates down.

From 100,000 events:

Decision name	Rate,%	Accepted	Mult	ms/evt
StrippingB2PPbarMuForTauMuLine_TIMING	0.0400	40	1.050	0.036
StrippingB2PPbarMuForTauMuTopoLine_TIMING	0.0060	6	1.333	0.032
StrippingB2PPbarMuForTauMuSSLine_TIMING	0.0200	20	1.100	0.039
StrippingB2PPbarMuForTauMufakePLine_TIMING	0.0430	43	1.279	0.046
StrippingB2PPbarMuForTauMuSSfakePLine_TIMING	0.0330	33	1.273	0.043
StrippingB2PPbarMuForTauMufakeMuLine_TIMING	0.0090	9	2.000	0.025
StrippingB2PPbarMuForTauMuSSfakeMuLine_TIMING	0.0200	20	4.200	0.152