Remove padding from table and add test

tests/by-util/test_lsmem.rs

@@ -9,3 +9,13 @@ use crate::common::util::TestScenario;
 fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
 }
+
+#[test]
+fn test_table_not_padded() {
+    let result = new_ucmd!().succeeds();
+    let stdout = result.code_is(0).stdout_str();
+    assert!(
+        !stdout.starts_with(' '),
+        "Table output should not start with a space"
+    );
+}