[ranges.syn] Remove "inline" from constexpr variable template added in P2164R9 as per #4625.

Author: burblebee

source/ranges.tex

@@ -437,7 +437,7 @@
   class enumerate_view;                                                             // freestanding
 
   template<class View>
-    inline constexpr bool enable_borrowed_range<enumerate_view<View>> =             // freestanding
+    constexpr bool enable_borrowed_range<enumerate_view<View>> =                    // freestanding
       enable_borrowed_range<View>;
 
   namespace views { inline constexpr @\unspec@ enumerate = @\unspec@; } // freestanding