Remove redundant escaping (#1277)

Author: elharo

src/main/java/org/apache/maven/plugins/assembly/utils/TypeConversionUtils.java

@@ -71,7 +71,7 @@ public static int modeToInt(final String mode, final Logger logger) throws Assem
 
  return value;
  } catch (final NumberFormatException e) {
- throw new AssemblyFormattingException("Failed to parse mode as an octal number: \'" + mode + "\'.", e);
+ throw new AssemblyFormattingException("Failed to parse mode as an octal number: '" + mode + "'.", e);
  }
  }
 

src/test/java/org/apache/maven/plugins/assembly/utils/TypeConversionUtilsTest.java

@@ -100,7 +100,7 @@ private void checkFileModeSanity(
  final String message = warnings.getAllValues().toString();
 
  for (final String checkMessage : messagesToCheckIfInsane) {
- assertTrue(message.contains(checkMessage), "\'" + checkMessage + "\' is not present in output.");
+ assertTrue(message.contains(checkMessage), "'" + checkMessage + "' is not present in output.");
  }
  }
  }