scripts: Remove unnecessary () around if/while conditions in Python

Not needed in Python. Detected by check C0325 in pylint3.

Also replace an

  if len(tag):

with just

  if tag:

Empty strings, byte strings, lists, etc., are falsy in Python.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
diff --git a/scripts/process_gperf.py b/scripts/process_gperf.py
index de9298d..4dc615f 100755
--- a/scripts/process_gperf.py
+++ b/scripts/process_gperf.py
@@ -54,7 +54,7 @@
     ctr = 3
     i = 0
 
-    while (True):
+    while True:
         if i >= len(addr_str):
             break