[chirp_devel] Update to TYT TH-UV8000 Driver

[Rick DeWitt AA0RD]

Users found an issue with tuning steps errors.
I had to enable "rf.has_nostep_tuning" to allow frequency multiples of 
2k or less.

-- 
Rick DeWitt
AA0RD
Sequim, Washington, USA 98382
(360) 681-3494

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# HG changeset patch
# User Rick DeWitt <aa0rd at yahoo.com>
# Date 1563403069 25200
#      Wed Jul 17 15:37:49 2019 -0700
# Node ID b1edba30b4ae09b0dc7cc18f662132da1a81227c
# Parent  3dd5c5a5238b9d80f21cf2f10ad20c43e90c0228
[th_uv8000] Fix to tuning steps; issues #6909 and #6913

Fixes #6909 and #6913 are due to needing rf.has_nostep_tuning enabled

diff -r 3dd5c5a5238b -r b1edba30b4ae chirp/drivers/th_uv8000.py
--- a/chirp/drivers/th_uv8000.py	Wed Jul 17 08:54:06 2019 -0700
+++ b/chirp/drivers/th_uv8000.py	Wed Jul 17 15:37:49 2019 -0700
@@ -554,7 +554,8 @@
         rf.has_settings = True
         rf.has_bank = False
         rf.has_comment = False
-        rf.has_tuning_step = False  # Not as chan feature
+        rf.has_nostep_tuning = True     # Radio accepts any entered freq
+        rf.has_tuning_step = False      # Not as chan feature
         rf.can_odd_split = False
         rf.has_name = True
         rf.has_offset = True