TMA: Trim version 4.5

This commit removes the older version of TMA spreadsheet. While 4.7
isn't the latest version, removing 4.5 simplifies to a single version
here. Summary of files as follows.

TMA 4.7 (kept):
  TMA_Metrics-full.csv
  TMA_Metrics-full.xlsx

TMA 4.5 (removed):
  TMA_Metrics-4.5-full.xlsx
  TMA_Metrics.csv
  TMA_Metrics.xlsx

Author: edwarddavidbaker