[gnome-system-monitor] Use correct x-axis labels (fixes #175)

[Robert Roth <robertroth src gnome org>]

commit 48feb01d20d2c68a7e13f945b70eb26a9d548f37
Author: Robert Roth <robert roth off gmail com>
Date:   Mon Mar 1 09:56:21 2021 +0200

    Use correct x-axis labels (fixes #175)

 src/load-graph.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/load-graph.cpp b/src/load-graph.cpp
index 5282ce23..62292f38 100644
--- a/src/load-graph.cpp
+++ b/src/load-graph.cpp
@@ -264,7 +264,7 @@ static void draw_background(LoadGraph *graph) {
     }
 
 
-    const unsigned total_seconds = graph->speed * (graph->num_points - 2) / 1000;
+    const unsigned total_seconds = graph->speed * (graph->num_points - 2) / 1000 * graph->frames_per_unit;
 
     for (unsigned int i = 0; i < 7; i++) {
         double x = (i) * (graph->draw_width - graph->rmargin - graph->indent) / 6;