Clean up if in CharUtilsTest#testIsAscii_char

The if statement calls assertTrue on the if branch and assertFalse on
the else branch on the same expression. This can easily be simplified
to assertEquals with a boolean expression to make the code clean and
easier to read.

src/test/java/org/apache/commons/lang3/CharUtilsTest.java

@@ -220,11 +220,7 @@ public class CharUtilsTest {
         assertFalse(CharUtils.isAscii(CHAR_COPY));
 
         for (int i = 0; i < 128; i++) {
-            if (i < 128) {
-                assertTrue(CharUtils.isAscii((char) i));
-            } else {
-                assertFalse(CharUtils.isAscii((char) i));
-            }
+            assertEquals(i < 128, CharUtils.isAscii((char) i));
         }
     }