Revert [a69a8131fa] "Fix bug in CompareTool when pdfstream from output file has filter different from cmp file"

Comparison of encoded streams has more problems and this fix wasn't
covering all of them, in fact it revealed them and caused more test failures.

ITXT-CR-749

Autoported commit.
Original commit hash: [b7a901674e]

Author: yulian-gaponenko

itext.tests/itext.kernel.tests/itext/kernel/utils/CompareToolTest.cs

@@ -133,20 +133,6 @@ public virtual void CompareToolErrorReportTest04() {
                  + "simple_pdf.report.xml"), "CompareTool report differs from the reference one");
         }
 
-        /// <exception cref="System.Exception"/>
-        /// <exception cref="System.IO.IOException"/>
-        [NUnit.Framework.Test]
-        public virtual void ImgFilterDiffTest() {
-            CompareTool compareTool = new CompareTool();
-            compareTool.SetGenerateCompareByContentXmlReport(true);
-            String outPdf = sourceFolder + "imgFilterDiff.pdf";
-            String cmpPdf = sourceFolder + "cmp_imgFilterDiff.pdf";
-            String result = compareTool.CompareByContent(outPdf, cmpPdf, destinationFolder);
-            // test that compareByContent doesn't fail with error
-            System.Console.Out.WriteLine(result);
-            NUnit.Framework.Assert.IsNotNull(result);
-        }
-
         /// <exception cref="System.IO.IOException"/>
         [NUnit.Framework.Test]
         public virtual void DifferentProducerTest() {

itext.tests/itext.kernel.tests/resources/itext/kernel/utils/CompareToolTest/cmp_imgFilterDiff.pdf

@@ -1649,8 +1649,7 @@ private bool CompareObjects(PdfObject outObj, PdfObject cmpObj, CompareTool.Obje
 
         private bool CompareStreamsExtended(PdfStream outStream, PdfStream cmpStream, CompareTool.ObjectPath currentPath
             , CompareTool.CompareResult compareResult) {
-            bool toDecode = PdfName.FlateDecode.Equals(outStream.Get(PdfName.Filter)) && PdfName.FlateDecode.Equals(cmpStream
-                .Get(PdfName.Filter));
+            bool toDecode = PdfName.FlateDecode.Equals(outStream.Get(PdfName.Filter));
             byte[] outStreamBytes = outStream.GetBytes(toDecode);
             byte[] cmpStreamBytes = cmpStream.GetBytes(toDecode);
             if (JavaUtil.ArraysEquals(outStreamBytes, cmpStreamBytes)) {

itext.tests/itext.kernel.tests/resources/itext/kernel/utils/CompareToolTest/imgFilterDiff.pdf

@@ -1 +1 @@
-bff5c021deff1084c9900878ac6c85f983d82b76
+b7a901674e5cb6ae3c018047fdc5c80598478de2