fix: add test

Author: rustyconover

test/sql/textplot.test

@@ -21,3 +21,8 @@ query T
 SELECT tp_density([1,2,3], width := 5);
 ----
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+
+query T
+select tp_sparkline([3,3,4,2,2,1,-5,-5], mode := 'delta', theme := 'thumbs', width:= 5);
+----
+👍👍👎👎👎