[r=anton] when saving modified file templates perform save only if template's text was really changed (IDEA-68964)

java/java-tests/testSrc/com/intellij/ide/fileTemplates/FileTemplatesTest.java

@@ -124,7 +124,6 @@ public class FileTemplatesTest extends IdeaTestCase {
       assertEquals("public class XXX {\n}", psiClass.getContainingFile().getText());
     }
     finally {
-      FileTemplateManager.getInstance().saveAll();
       FileTemplateManager.getInstance().removeTemplate(template);
     }
   }