Fix: EWW_NET wrong values for TX/RX stats (#1108)

* Fix: EWW_NET wrong values for TX/RX stats

The sysinfo crate, structure Networks, basically caches one value of
total_received/total_transmitted each (as well as other metrics) and
returns the difference between those two values when queried via the
`received()` and `transmitted()` functions.

These values are updated by both the `refresh()` and `refresh_list()`
functions; so by calling both of them right after each other like
previously done here, sets both the cached total_received/... and the
current total_received/... to nearly the same value.

`refresh_list()` also updates the list of interfaces on a host, with a
marginally small performance impact for doing so (I measured slightly
more than 100 microseconds on my machine (0.1 milliseconds), around
20-25% more than with `refresh()`), especially considering this is run
only every 2 seconds.

* Add changelog entry for the EWW_NET bugfix

CHANGELOG.md

@@ -9,6 +9,7 @@ All notable changes to eww will be listed here, starting at changes since versio
 - Fix and refactor nix flake (By: w-lfchen)
 - Fix remove items from systray (By: vnva)
 - Fix the gtk `stack` widget (By: ovalkonia)
+- Fix values in the `EWW_NET` variable (By: mario-kr)
 
 ### Features
 - Update rust toolchain to 1.80.1 (By: w-lfchen)

crates/eww/src/config/system_stats.rs

@@ -212,7 +212,6 @@ pub fn net() -> String {
     let (ref mut last_refresh, ref mut networks) = &mut *NETWORKS.lock().unwrap();
 
     networks.refresh_list();
-    networks.refresh();
     let elapsed = last_refresh.next_refresh();
 
     networks