Check an Input's pressed set before adding to just_released. (#4209)

# Objective

- Fixes #4208

## Solution

- Adds a check before inserting into an `Input`'s `just_released` set, in the same way that one exists for adding into the `just_pressed` set.

crates/bevy_input/src/input.rs

@@ -70,10 +70,13 @@ where
 
     /// Register a release for input `input`.
     pub fn release(&mut self, input: T) {
-        self.pressed.remove(&input);
+        if self.pressed(input) {
             self.just_released.insert(input);
         }
 
+        self.pressed.remove(&input);
+    }
+
     /// Check if `input` has been just pressed.
     pub fn just_pressed(&self, input: T) -> bool {
         self.just_pressed.contains(&input)