Fix typos in pcbnew sub-directory

Found via `codespell -q 3 -S *.po,./thirdparty,./Documentation/changelogs -L aactual,acount,aline,alocation,alog,anormal,anumber,aother,apoints,aparent,aray,ba,busses,dout,einstance,leaded,modul,ontext,ot,overide,serie,te,,tesselate,tesselator,tht`

pcbnew/python/scripting/pcb_scripting_tool.h

@@ -52,7 +52,7 @@ private:
     ///< Reload Python plugins and reset toolbar (if in pcbnew)
     int reloadPlugins( const TOOL_EVENT& aEvent );
 
-    ///< Call LoadPlugins method of the scripting module with apropriate paths
+    ///< Call LoadPlugins method of the scripting module with appropriate paths
     ///< Must be called under PyLOCK
     static void callLoadPlugins();