Revert: "Fix #7151: Hang when concurrently starting AIs in multiplayer, or with shift pressed."

This reverts commit b1e40b6b56.

This is a fix for a patch that will be reverted in the next commit.

src/company_cmd.cpp

@@ -724,10 +724,6 @@ void OnTick_Companies()
 		/* Allow multiple AIs to possibly start in the same tick. */
 		do {
 			if (!MaybeStartNewCompany()) break;
-
-			/* In networking mode, we can only send a command to start but it
-			 * didn't execute yet, so we cannot loop. */
-			if (_networking) break;
 		} while (AI::GetStartNextTime() == 0);
 	}