cli tests: correct program data account test check

[buffalojoec]

Problem

When going through #337 to narrow down root cause for #436, I noticed one small
error in a CLI unit test.

The original test was checking the program data account's executable field
here, not the program account.

Solution

Correct the one line in the test to check the program data account.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.8%. Comparing base (0025ecd) to head (3518208).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #660     +/-   ##
=========================================
- Coverage    81.8%    81.8%   -0.1%     
=========================================
  Files         851      851             
  Lines      230370   230369      -1     
=========================================
- Hits       188669   188606     -63     
- Misses      41701    41763     +62     

[HaoranYi]

good catch. lgtm!