tools: fix flake8 warnings about missing double empty lines

tools/merge_ratbagd.py

@@ -63,5 +63,6 @@ def main(argv):
     except AttributeError:
         pass
 
+
 if __name__ == "__main__":
     main(sys.argv[1:])

tools/ratbagc.py.in

@@ -29,6 +29,7 @@ from evdev import ecodes
 
 LIBRATBAG_DATA_DIR = "@LIBRATBAG_DATA_DIR@"
 
+
 # Deferred translations, see https://docs.python.org/3/library/gettext.html#deferred-translations
 def N_(x):
     return x

tools/ratbagctl.in

@@ -30,6 +30,7 @@ import re
 
 from ratbagd import Ratbagd, RatbagdDevice, RatbagdProfile, RatbagdMacro, RatbagdResolution, RatbagdButton, RatbagdLed, RatbagdDBusUnavailable, RatbagError, RatbagErrorCode, RatbagErrorCapability  # NOQA
 
+
 button_specials_strmap = {
     RatbagdButton.ACTION_SPECIAL_UNKNOWN: "unknown",
     RatbagdButton.ACTION_SPECIAL_DOUBLECLICK: "doubleclick",
@@ -662,6 +663,7 @@ def dpi(string):
     else:
         return (int_x, int_y)
 
+
 # note: 'eventX' is assumed at the end of each command
 parser_def = [
     {
@@ -1419,6 +1421,7 @@ class RatbagParserLink(RatbagParser):
         dest = self.get_dest()
         print("  {:<36}Use {}for '{} Commands'".format(prefix + self.dest + " ...", prefix, dest.group))
 
+
 classes = {
     switch: RatbagParserSwitch,
     set: RatbagParserSet,
@@ -1553,5 +1556,6 @@ def main(argv):
             else:
                 f(r, cmd)
 
+
 if __name__ == "__main__":
     main(sys.argv[1:])