lang: Remove duplicate test

It's contents were identical to the stmtfunc-recursive-double.txtar
test.

lang/interpret_test/TestAstFunc2/stmtfunc-recursive-no-operators.txtar

@@ -1,34 +0,0 @@
--- main.mcl --
-import "fmt"
-
-# recursive function (not supported!)
-func sum1($in) {
-	if $in < 0 {
-		-1 * sum2(-1 * $in)
-	} else {
-		if $in == 0 {
-			0 # terminate recursion
-		} else {
-			$in + sum2($in - 1)
-		}
-	}
-}
-func sum2($in) {
-	if $in < 0 {
-		-1 * sum1(-1 * $in)
-	} else {
-		if $in == 0 {
-			0 # terminate recursion
-		} else {
-			$in + sum1($in - 1)
-		}
-	}
-}
-
-$out1 = sum1(4) # 4 + 3 + 2 + 1 + 0 = 10
-$out2 = sum2(-5) # -5 + -4 + -3 + -2 + -1 + -0 = -15
-
-test fmt.printf("sum1(4) is %d", $out1) {}
-test fmt.printf("sum2(-5) is %d", $out2) {}
--- OUTPUT --
-# err: errSetScope: recursive reference while setting scope: not a dag