Editor: replace Utils::Text::Replacement with Utils::ChangeSet::EditOp for formatting

Removes the last usage of Utils::Text::Replacement with a more commonly used pattern.

Change-Id: I0912bf61388a58ddaba424380ec139f9aa15fc4c
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/utils/changeset.h

@@ -103,6 +103,8 @@ private:
     bool m_error;
 };
 
+using EditOperations = QList<ChangeSet::EditOp>;
+
 inline bool operator<(const ChangeSet::Range &r1, const ChangeSet::Range &r2)
 {
     return r1.start < r2.start;