Remove snap installed PlotJuggler (#20989)

* use our compiled plotjuggler

* update readme

* update readme
old-commit-hash: f3d41de9d8

tools/plotjuggler/README.md

@@ -4,14 +4,10 @@ We've extended [PlotJuggler](https://github.com/facontidavide/PlotJuggler) to pl
 
 ## Installation
 
-Once you've cloned openpilot, install our plugin with this command:
+Once you've cloned and are in openpilot, download PlotJuggler and install our plugins with this command:
 
 `cd tools/plotjuggler && ./install.sh`
 
-Usage requires an installation of PlotJuggler. On systems with snap (e.g. Ubuntu), you can install PlotJuggler with this command:
-
- `sudo snap install plotjuggler`
-
 ## Usage
 
 ```
@@ -36,7 +32,7 @@ Example:
 
 `./juggle.py "0982d79ebb0de295|2021-01-17--17-13-08"`
 
-### Streaming
+## Streaming
 
 To get started exploring and plotting data live in your car, you can start PlotJuggler in streaming mode: `./juggle.py --stream`.
 

tools/plotjuggler/juggle.py

@@ -27,7 +27,7 @@ def load_segment(segment_name):
 def start_juggler(fn=None, dbc=None, layout=None):
   env = os.environ.copy()
   env["BASEDIR"] = BASEDIR
-  pj = os.getenv("PLOTJUGGLER_PATH", "plotjuggler")
+  pj = os.getenv("PLOTJUGGLER_PATH", os.path.join(juggle_dir, "bin/plotjuggler"))
 
   if dbc:
     env["DBC_NAME"] = dbc