configure: Change screenpresso_decoder to select zlib instead of dep

zlib is used as a suggest/select target not a dep
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

configure

@@ -2327,7 +2327,7 @@ rv20_decoder_select="h263_decoder"
 rv20_encoder_select="h263_encoder"
 rv30_decoder_select="golomb h264pred h264qpel mpegvideo rv34dsp"
 rv40_decoder_select="golomb h264pred h264qpel mpegvideo rv34dsp"
-screenpresso_decoder_deps="zlib"
+screenpresso_decoder_select="zlib"
 shorten_decoder_select="golomb"
 sipr_decoder_select="lsp"
 snow_decoder_select="dwt h264qpel hpeldsp me_cmp rangecoder videodsp"