fdo#78004 fix string formatting

Added missing 's'

Change-Id: I7570d86d65ebcffc547b06ab9c19843de0b90436
Reviewed-on: https://gerrit.libreoffice.org/9181Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

nlpsolver/src/com/sun/star/comp/Calc/NLPSolver/BaseNLPSolver.java

@@ -553,7 +553,7 @@ public abstract class BaseNLPSolver extends WeakBase
 
         if (days > 0)
             return String.format("%d %s, %d %s",
-                  days, resourceManager.getLocalizedString(String.format("Time.Day%", days == 1 ? "" : "s"), "Days"),
+                  days, resourceManager.getLocalizedString(String.format("Time.Day%s", days == 1 ? "" : "s"), "Days"),
                   hours, resourceManager.getLocalizedString(String.format("Time.Hour%s", hours == 1 ? "" : "s"), "Hours"));
 
         if (hours > 0)