config: Fix ngx_module_type
config: Fix ngx_module_type

Since commit 37182ce2f3b6 the module was not present in static builds
because due to an invalid "ngx_module_type" the module was not added to
objs/ngx_modules.c.

This commit will fix the problem by setting the correct module type
"HTTP_FILTER" [Link 1].

Link 1: https://www.nginx.com/resources/wiki/extending/new_config/#key-ngx_module_type
Gentoo-Bug: https://bugs.gentoo.org/593450
Fixes: https://github.com/masterzen/nginx-upload-progress-module/issues/50

masterzen/nginx-upload-progress-module,gencer/nginx-upload-progress-module,gencer/nginx-upload-progress-module,masterzen/nginx-upload-progress-module