Merge bitcoin/bitcoin#26888: net: simplify the call to vProcessMsg.splice()

dfc01ccd73e1f12698278d467c241f398da9fc7d net: simplify the call to vProcessMsg.splice() (Vasil Dimov)

Pull request description:

  At the time when

  ```cpp
  pnode->vProcessMsg.splice(pnode->vProcessMsg.end(), pnode->vRecvMsg, pnode->vRecvMsg.begin(), it);
  ```

  is called, `it` is certainly `pnode->vRecvMsg.end()` which makes the call equivalent to:

  ```cpp
  pnode->vProcessMsg.splice(pnode->vProcessMsg.end(), pnode->vRecvMsg, pnode->vRecvMsg.begin(), pnode->vRecvMsg.end());
  ```

  which is equivalent to:

  ```cpp
  pnode->vProcessMsg.splice(pnode->vProcessMsg.end(), pnode->vRecvMsg);
  ```

  Thus, use the latter. Further, maybe irrelevant, but the latter has constant complexity while the original code is `O(length of vRecvMsg)`.

ACKs for top commit:
  theStack:
    Code-review ACK dfc01ccd73e1f12698278d467c241f398da9fc7d
  MarcoFalke:
    review ACK dfc01ccd73e1f12698278d467c241f398da9fc7d   🐑
  jonatack:
    Light review ACK dfc01ccd73e1f12698278d467c241f398da9fc7d

Tree-SHA512: 9f4eb61d1caf4af9a61ba2f54b915fcfe406db62c58ab1ec42f736505b6792e9379a83d0458d6cc04f289edcec070b7c962f94a920ab51701c3cab103152866f

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