style(renderer): capture generic consts as decls in returned struct

Out of an abundance of caution, since there have been issues in the past
relating to consts outside of the returned struct.

src/renderer/generic.zig

@@ -68,6 +68,9 @@ const log = std.log.scoped(.generic_renderer);
 /// [ Texture ] - An abstraction over a GPU texture.
 ///
 pub fn Renderer(comptime GraphicsAPI: type) type {
+    return struct {
+        const Self = @This();
+
         const Target = GraphicsAPI.Target;
         const Buffer = GraphicsAPI.Buffer;
         const Texture = GraphicsAPI.Texture;
@@ -83,9 +86,6 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
 
         const ImagePlacementList = std.ArrayListUnmanaged(imagepkg.Placement);
 
-    return struct {
-        const Self = @This();
-
         /// Allocator that can be used
         alloc: std.mem.Allocator,