Fix all_tuples macro for non-0/1 starts (#4002)

# Objective
`all_tuples` panics when the start count is set to anything other than 0 or 1. Fix this bug.

## Solution
Originally part of #2381, this PR fixes the slice indexing used by the proc macro.

crates/bevy_ecs/macros/src/lib.rs

@@ -46,7 +46,7 @@ impl Parse for AllTuples {
 #[proc_macro]
 pub fn all_tuples(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as AllTuples);
-    let len = (input.start..=input.end).count();
+    let len = input.end - input.start;
     let mut ident_tuples = Vec::with_capacity(len);
     for i in input.start..=input.end {
         let idents = input
@@ -66,7 +66,7 @@ pub fn all_tuples(input: TokenStream) -> TokenStream {
 
     let macro_ident = &input.macro_ident;
     let invocations = (input.start..=input.end).map(|i| {
-        let ident_tuples = &ident_tuples[0..i];
+        let ident_tuples = &ident_tuples[0..i - input.start];
         quote! {
             #macro_ident!(#(#ident_tuples),*);
         }