[apache#6273] improve(CLI): Fix TableFormat properties. (apache#6286)

### What changes were proposed in this pull request?

Fix TableFormat properties.

### Why are the changes needed?

Fix: apache#6273 

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

local test.

clients/cli/src/main/java/org/apache/gravitino/cli/outputs/TableFormat.java

@@ -111,10 +111,10 @@ static final class TableFormatImpl {
         Pattern.compile(
             "[\u1100-\u115F\u2E80-\uA4CF\uAC00-\uD7A3\uF900-\uFAFF\uFE10-\uFE19\uFE30-\uFE6F\uFF00-\uFF60\uFFE0-\uFFE6]");
     private int[][] elementOutputWidths;
-    private final String horizontalDelimiter = "-";
-    private final String verticalDelimiter = "|";
-    private final String crossDelimiter = "+";
-    private final String indent = " ";
+    private static final String horizontalDelimiter = "-";
+    private static final String verticalDelimiter = "|";
+    private static final String crossDelimiter = "+";
+    private static final String indent = " ";
 
     public void debug() {
       System.out.println();