fix: always show at least 5 samples

dataloggerui/htmlui.py

@@ -605,7 +605,7 @@ def html_ui_samples():
         n_samples = int(request.args['n_samples'])
         n_samples = max(1, n_samples)  # discard 0 samples
     else:
-        n_samples = min(15, total)
+        n_samples = max(min(25, total), 5)
 
     samples = []
     index = list(range(total - n_samples, total))