Fix line justification bug.

Runtime/ui/txt/paragraph.cs

             // Break the line into words if justification should be applied.
             bool justifyLine = this._paragraphStyle.textAlign == TextAlign.justify &&
                                lineNumber != lineLimit - 1 && !lineRange.hardBreak;
+
+            this._findWords(lineRange.start, lineRange.end, words);
-
-            this._findWords(lineRange.start, lineRange.end, words);
+            
             this._computeLineStyleRuns(lineStyleRuns, lineRange, ref styleRunIndex);
             for (int lineStyleRunIndex = 0; lineStyleRunIndex < lineStyleRuns.Count; ++lineStyleRunIndex) {
                 glyphPositions.Clear();