Update a system monitoring needle for Silverblue

This got missed in the big GNOME 46 needle update because
Silverblue wasn't composing.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/gnome/apps/sysmon/sysmon_fsystems_shown-silverblue-20240131.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "ypos": 137,
+      "height": 53,
+      "xpos": 1,
+      "type": "match",
+      "width": 148
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "sysmon_fsystems_shown"
+  ]
+}