fix #1979: generated Owned impl for the props builder was using the wrong generics. (#2027)

This commit fixes the owned impl to use the original generics rather than the build generics.

packages/signals/examples/read_only_degrade.rs

@@ -0,0 +1,30 @@
+//! Signals can degrade into a ReadOnlySignal variant automatically
+//! This is done thanks to a conversion by the #[component] macro
+
+use dioxus::prelude::*;
+
+fn main() {
+    launch(app);
+}
+
+fn app() -> Element {
+    let mut count = use_signal(|| 0);
+
+    rsx! {
+        h1 { "High-Five counter: {count}" }
+        button { onclick: move |_| count += 1, "Up high!" }
+        button { onclick: move |_| count -= 1, "Down low!" }
+        Child {
+            count,
+            "hiiii"
+        }
+    }
+}
+
+#[component]
+fn Child(count: ReadOnlySignal<i32>, children: Element) -> Element {
+    rsx! {
+        div { "Count: {count}" }
+        {children}
+    }
+}