Remove redundant guards from fetch state matching

The guards 'when data.current_drive != nil' etc. on the simple atom
patterns ':driving', ':updating', ':charging' are unnecessary. The state
atom itself is the source of truth - if we're in ':driving', the
dual-write invariant guarantees current_drive is populated. The guards
added nothing over the atom pattern match.

Author: brianmay

lib/teslamate/vehicles/vehicle.ex

@@ -1517,13 +1517,13 @@ defmodule TeslaMate.Vehicles.Vehicle do
             :online ->
               true
 
-            :driving when data.current_drive != nil ->
+            :driving ->
               true
 
-            :updating when data.current_update != nil ->
+            :updating ->
               true
 
-            :charging when data.current_charging_process != nil ->
+            :charging ->
               true
 
             :start ->
@@ -1549,9 +1549,9 @@ defmodule TeslaMate.Vehicles.Vehicle do
         reachable? =
           case expected_state do
             :online -> true
-            :driving when data.current_drive != nil -> true
-            :updating when data.current_update != nil -> true
-            :charging when data.current_charging_process != nil -> true
+            :driving -> true
+            :updating -> true
+            :charging -> true
             :start -> false
             {:offline, _} -> false
             {:asleep, _} -> false