Revert "Toolbar: Only show on WikiText pages"

Classical toolbar no longer appears in Page namespace on Wikisources.

This reverts commit 7263ef1e002786b27fa06db43aa7a6fca00461fb.

Bug: 69447
Bug: 29908
Change-Id: Ifafe41f7bc91183e0db4c10d8340a8b620b380bc
Merge "Revert "Toolbar: Only show on WikiText pages""