Improve aliased struct completions #289

Job	Run time
static analysis (Elixir 1.14.x \| Erlang/OTP 25.x)	4m 16s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 48s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 49s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	3m 1s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 11s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	2m 14s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 46s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 21s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	2m 1s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 59s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 5s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 15s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 20s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 11s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 6s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 13s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 2s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 30s
	37m 36s

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