rg_tool: Fixed not working correctly on Windows with esp-idf 4.4

esp-idf 4.4 does some fancy powershell stuff instead of adding commands to the PATH:

````
function idf.py { &python "$IDF_PATH\tools\idf.py" $args }
function espefuse.py { &python "$IDF_PATH\components\esptool_py\esptool\espefuse.py" $args }
function espsecure.py { &python "$IDF_PATH\components\esptool_py\esptool\espsecure.py" $args }
function otatool.py { &python "$IDF_PATH\components\app_update\otatool.py" $args }
function parttool.py { &python "$IDF_PATH\components\partition_table\parttool.py" $args }
````

`subprocess.run`'s subshell can't see or run those.

rg_tool.py

@@ -28,11 +28,16 @@
 except:
     PROJECT_VER = "unknown"
 
+# esp-idf 4.4 makes powershell functions on Windows instead of adding these to the PATH...
+# doesn't really hurt to have them again even if they're in PATH, so let's always do it...
+os.environ["PATH"] += os.pathsep + os.path.join(os.getenv("IDF_PATH"), "components", "partition_table")
+os.environ["PATH"] += os.pathsep + os.path.join(os.getenv("IDF_PATH"), "components", "esptool_py", "esptool")
+
 IDF_PY = "idf.py"
 ESPTOOL_PY = "esptool.py"
 PARTTOOL_PY = "parttool.py"
 IDF_MONITOR_PY = "idf_monitor.py"
-GEN_ESP32PART_PY = os.path.join(os.getenv("IDF_PATH"), "components", "partition_table", "gen_esp32part.py")
+GEN_ESP32PART_PY = "gen_esp32part.py"
 MKFW_PY = os.path.join("tools", "mkfw.py")
 
 if os.path.exists("rg_config.py"):