Revert 'protected' FontSelectorStrategy#tempFonts field renaming

This field is part of public API which shall not be broken between
minor releases. The field is deprecated and will be removed in next
major release.

DEVSIX-3918

Author: yulian-gaponenko

layout/src/main/java/com/itextpdf/layout/font/FontSelectorStrategy.java

@@ -56,13 +56,17 @@ public abstract class FontSelectorStrategy {
     protected String text;
     protected int index;
     protected final FontProvider provider;
-    protected final FontSet additionalFonts;
+    /**
+     * @deprecated This field will be renamed to {@code additionalFonts} in iText Core 7.2.
+     */
+    @Deprecated
+    protected final FontSet tempFonts;
 
     protected FontSelectorStrategy(String text, FontProvider provider, FontSet additionalFonts) {
         this.text = text;
         this.index = 0;
         this.provider = provider;
-        this.additionalFonts = additionalFonts;
+        this.tempFonts = additionalFonts;
     }
 
     public boolean endOfText() {
@@ -81,6 +85,6 @@ public boolean endOfText() {
      * @see FontProvider#getPdfFont(FontInfo, FontSet)
      */
     protected PdfFont getPdfFont(FontInfo fontInfo) {
-        return provider.getPdfFont(fontInfo, additionalFonts);
+        return provider.getPdfFont(fontInfo, tempFonts);
     }
 }