Fix dctdnoiz dependencies, the filter should select dct, not fft.

Fixes compilation with --disable-everything --enable-filter=dctdnoiz

configure

@@ -2351,7 +2351,7 @@ boxblur_filter_deps="gpl"
 colormatrix_filter_deps="gpl"
 cropdetect_filter_deps="gpl"
 dctdnoiz_filter_deps="avcodec"
-dctdnoiz_filter_select="fft"
+dctdnoiz_filter_select="dct"
 delogo_filter_deps="gpl"
 deshake_filter_deps="avcodec"
 deshake_filter_select="dsputil"