style: Fix PEP8 blank lines issues in Python files

Done with `autopep8 --select=E3,W3`, fixes:

- E301 - Add missing blank line.
- E302 - Add missing 2 blank lines.
- E303 - Remove extra blank lines.
- E304 - Remove blank line following function decorator.
- E309 - Add missing blank line.
- W391 - Remove trailing blank lines.

platform/iphone/detect.py

@@ -5,9 +5,11 @@ import sys
 def is_active():
     return True
 
+
 def get_name():
     return "iOS"
 
+
 def can_build():
 
     import sys
@@ -17,6 +19,7 @@ def can_build():
 
     return False
 
+
 def get_opts():
 
     return [
@@ -33,6 +36,7 @@ def get_opts():
         ('ios_sim', 'Build simulator binary', 'no'),
     ]
 
+
 def get_flags():
 
     return [
@@ -43,7 +47,6 @@ def get_flags():
     ]
 
 
-
 def configure(env):
 
     env.Append(CPPPATH=['#platform/iphone'])