Remove waterfall from all modes except listening post

Reverts IQ pipeline and removes syncWaterfallToFrequency calls from
pager, sensor, rtlamr, DMR, SSTV, and SSTV general modes. Waterfall
is now exclusive to listening post mode.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

static/js/modes/dmr.js

@@ -88,9 +88,6 @@ function startDmr() {
             if (typeof reserveDevice === 'function') {
                 reserveDevice(parseInt(device), 'dmr');
             }
-            if (typeof syncWaterfallToFrequency === 'function') {
-                syncWaterfallToFrequency(frequency, { autoStart: true, restartIfRunning: true, silent: true });
-            }
             if (typeof showNotification === 'function') {
                 showNotification('DMR', `Decoding ${frequency} MHz (${protocol.toUpperCase()})`);
             }