fix: range check error when starting SSH tunnel

TProcess.ExitStatus is a signed Integer, so don't store it in a LongWord.

Author: FingerlessGlov3s

source/dbconnection.pas

@@ -1079,7 +1079,7 @@ procedure TSecureShellCmd.Connect;
   SshCmd, SshCmdDisplay, DialogTitle, TargetHost: String;
   OutText, ErrorText, AllPipesText, UserInput: String;
   rx: TRegExpr;
-  ExitCode: LongWord;
+  ExitCode: Integer;
   PortChecks, i: Integer;
   CheckIntervalMs: Integer;
   TimeStartedMs, WaitedMs, TimeOutMs: Int64;