Patch to dropbox.py to get the correct PID when running Dropbox via flatpak

dropbox.patch

--- dropbox.py
+++ dropbox.py
@@ -134,11 +134,12 @@
         FatalVisibleError("Platform not supported")

 def is_dropbox_running():
-    pidfile = os.path.expanduser("~/.dropbox/dropbox.pid")
-
     try:
-        with open(pidfile, "r") as f:
-            pid = int(f.read())
+        pid = subprocess.run("flatpak ps | awk '/dropbox/ { print $2 }'",
+                             shell=True, encoding="UTF-8",
+                             stdout=subprocess.PIPE)
+        pid = int(pid.stdout.strip())
+
         with open("/proc/%d/cmdline" % pid, "r") as f:
             cmdline = f.read().lower()
     except:
EOF

For issue flathub/com.dropbox.Client#43