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This reverts commit 605e564b.

Rationale: Stability matters:

Quoting 605e564b:
> Besides changing only recv window size at runtime breaks compatibility with
> openssh: if we only do `-W 1M` on server and try to upload data with openssh as
> client, dropbear complains
>
>     [3302] Apr 17 23:10:06 Exit (slapuser2): Bad packet size 32777
>
> and connection terminates. Thus RECV_MAX_PAYLOAD_LEN increase is also
> required, which cannot be done via option at runtime:
>
>     https://github.com/mkj/dropbear/blob/DROPBEAR_0.53.1/options.h#L268
>
>     ---- 8< ----
>     /* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
>        in order to interoperate with other implementations */
>     #ifndef RECV_MAX_PAYLOAD_LEN
>     #define RECV_MAX_PAYLOAD_LEN 32768
>     #endif
>     ---- 8< ----
>
> So let's increase DEFAULT_RECV_WINDOW to 1M and RECV_MAX_PAYLOAD_LEN
> appropr...