imp - One-line center the bottom text in opening

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To make things look consistent, we've used one-line centered writer for bottom text in the opening splash of the modern welcome screen.

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Type: imp
Breaking: False
Doc Required: False
Part: 1/1

public/Nitrocid/Misc/Splash/Splashes/Welcome.cs

@@ -86,7 +86,7 @@ public override string Opening(SplashContext context)
  builder.Append(
  col.VTSequenceForeground +
  CenteredFigletTextColor.RenderCenteredFiglet(figFont, text) +
- CenteredTextColor.RenderCentered(consoleY - 1, bottomText)
+ CenteredTextColor.RenderCenteredOneLine(consoleY - 1, bottomText)
  );
  return builder.ToString();
  }