fix formatting and merging if chains in attributes (#2697)

* fix formatting and merging if chains in attributes

* fix autoformat if attribute chains

* Fix IfAttributeValue ToTokens implementation

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Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

examples/rsx_usage.rs

@@ -85,6 +85,9 @@ fn app() -> Element {
                 class: "{asd}",
                 // if statements can be used to conditionally render attributes
                 class: if formatting.contains("form") { "{asd}" },
+                // longer if chains also work
+                class: if formatting.contains("form") { "{asd}" } else if formatting.contains("my other form") { "{asd}" },
+                class: if formatting.contains("form") { "{asd}" } else if formatting.contains("my other form") { "{asd}" } else { "{asd}" },
                 div {
                     class: {
                         const WORD: &str = "expressions";