Merge #12970: logging: bypass timestamp formatting when not logging

339730a6d8 logging: bypass timestamp formatting when not logging (Cory Fields)

Pull request description:

  As suggested by @laanwj on IRC:
  ```
  <cfields> whoa
  <cfields> Leaving test case "knapsack_solver_test"; testing time: 358694ms
  <cfields> i386 + old wine ^^
  <cfields> Leaving test case "knapsack_solver_test"; testing time: 6781ms
  <cfields> ^^ same, but with the LogPrint commented out
  ...
  <wumpus> if both log-to-file and log-to-console is disabled, it should probably bypass all logging
  ```
  Edit: The painful line commented out being the LogPrintf in CWallet::AddToWallet.

Tree-SHA512: bc6da67dcdf05e9164fff7a7e9980de897e6f1b0d3f6e1ebde2162cbcba7d54a6ec94283534eb5a1ebde7134533d7fe7e496aa35ea3128c567ed6483eae5212c

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