Apply clippy fixes (#11770)

# Description
Clippy fixes for
[items_after_test_module](https://rust-lang.github.io/rust-clippy/master/index.html#/items_after_test_module)

# User-Facing Changes
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crates/nu-command/src/generators/seq.rs

@@ -115,18 +115,6 @@ fn seq(
     run_seq(rest_nums, span, contains_decimals, engine_state)
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_examples() {
-        use crate::test_examples;
-
-        test_examples(Seq {})
-    }
-}
-
 pub fn run_seq(
     free: Vec<f64>,
     span: Span,
@@ -210,3 +198,15 @@ impl Iterator for IntSeq {
         ret
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_examples() {
+        use crate::test_examples;
+
+        test_examples(Seq {})
+    }
+}