Improve CTS so that default CTS_ARGS gives as good results as tweaked CTS_ARGS in mock-array

[oharboe]

Description

1. delete CTS_ARGS from design/mock-array/config.mk
2. build
3. as good results in CTS as with tweaked CTS_ARGS

Without tweaks the macros in mock-array get more skew:

From gui_cts:

>>> report_clock_skew
Clock clock
 363.90 source latency ces_0_6/clock ^
  98.54 source clock tree delay
-294.87 target latency ces_1_6/clock ^
 -77.75 target clock tree delay
 -12.05 CRPR
--------------
  77.77 setup skew

Clock clock_vir
No launch/capture paths found.

For comparison, on master with -distance_between_buffers 60:

Suggested Solution

Just a reminder: fewer options is better.

Additional Context

No response

[oharboe]

@maliberty mentioned that microwatt needs a similar tweak, search ORFS for CTS_BUF_DISTANCE.