Revert [a69a813] "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

Author: yulian-gaponenko

kernel/src/main/java/com/itextpdf/kernel/utils/CompareTool.java

@@ -1448,7 +1448,7 @@ private boolean compareObjects(PdfObject outObj, PdfObject cmpObj, ObjectPath cu
     }
 
     private boolean compareStreamsExtended(PdfStream outStream, PdfStream cmpStream, ObjectPath currentPath, CompareResult compareResult) {
-        boolean toDecode = PdfName.FlateDecode.equals(outStream.get(PdfName.Filter)) && PdfName.FlateDecode.equals(cmpStream.get(PdfName.Filter));
+        boolean toDecode = PdfName.FlateDecode.equals(outStream.get(PdfName.Filter));
         byte[] outStreamBytes = outStream.getBytes(toDecode);
         byte[] cmpStreamBytes = cmpStream.getBytes(toDecode);
         if (Arrays.equals(outStreamBytes, cmpStreamBytes)) {

kernel/src/test/java/com/itextpdf/kernel/utils/CompareToolTest.java

@@ -123,19 +123,6 @@ public void compareToolErrorReportTest04() throws InterruptedException, IOExcept
 
     }
 
-
-    @Test
-    public void imgFilterDiffTest() throws InterruptedException, IOException {
-        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.out.println(result);
-        Assert.assertNotNull(result);
-    }
-
     @Test
     public void differentProducerTest() throws IOException {
         String expectedMessage = "Document info fail. Expected: \"iText\u00ae <version> \u00a9<copyright years> iText Group NV (iText Software; licensed version)\", actual: \"iText\u00ae <version> \u00a9<copyright years> iText Group NV (AGPL-version)\"";