wide: allow narrow or non-hopping startup

We might want to hop over a range of frequencies less than the sample
rate due to the relative bandwidth setting discarding edges of the
spectrum. We may also want to start the analyzer without hopping at all.

analyzer/workers/wide.c

@@ -297,9 +297,7 @@ suscan_local_analyzer_init_wide_worker(suscan_local_analyzer_t *self)
     SU_TRY(suscan_local_analyzer_readjust_detector(self, &det_params));
   }
 
-  SU_TRY(
-      self->parent->params.max_freq - self->parent->params.min_freq >=
-      self->source_info.source_samp_rate);
+  SU_TRY(self->parent->params.max_freq >= self->parent->params.min_freq);
 
   self->current_sweep_params.fft_min_samples =
           SUSCAN_ANALYZER_MIN_POST_HOP_FFTS * det_params.window_size;