When the Steelers take the field for Saturday night’s preseason game against the Buffalo Bills, Russell Wilson will get his first game action in a Pittsburgh uniform. Now fully healthy after suffering a calf strain, he will get the start after Justin Fields did so last week. It’s the latest turn in the ongoing competition between the two quarterbacks. In fact, according to Mike Tomlin, it’s not going to stop. Tomlin reaffirmed Wilson is in “pole position” for the starting job, but it’s still a true competition with Fields. Now that they’re both able to get game reps, the staff is going to cont…