Driver: Correct buffer instantiation for Rubato

I had slightly misread the changes from 0.12->0.14, so buffers were
not correctly instantiated for resampling.

src/driver/tasks/mixer/mix_logic.rs

@@ -172,7 +172,7 @@ pub fn mix_symph_indiv(
                     chan_c,
                 )
                 .expect("Failed to create resampler.");
-                let out_buf = resampler.output_buffer_allocate(false);
+                let out_buf = resampler.output_buffer_allocate(true);
 
                 (chan_c, resampler, out_buf)
             });

src/input/adapters/cached/util.rs

@@ -88,7 +88,7 @@ impl ToAudioBytes {
             )
             .expect("Failed to create resampler.");
 
-            let resampled_data = resampler.output_buffer_allocate(false);
+            let resampled_data = resampler.output_buffer_allocate(true);
 
             ResampleState {
                 resampled_data,