`tests/csgrep/sync.sh` does not work for tests 0076 and 0077

[kdudka]

% cd tests/csgrep

% ./sync.sh 0076-filter-file-basic
+./sync.sh:5> . ../test-lib.sh
+../test-lib.sh:5> export JSFILTER_CMD='sed -e '\''s|"version": "[^"]*"|"version": ""|g'\'
+./sync.sh:7> [[ 1 -eq 0 ]]
+./sync.sh:10> tests=( 0076-filter-file-basic ) 
+./sync.sh:13> tst=0076-filter-file-basic
+./sync.sh:14> tst=0076-filter-file-basic 
+./sync.sh:15> eval '../../csdiff_build/src/csgrep --remove-duplicates --filter-file ../../../tests/csgrep/0076-filter-file-basic-filter.json 0076-filter-file-basic-stdin.txt'
+./sync.sh:16> eval 'sed -e '\''s|"version": "[^"]*"|"version": ""|g'\'
+(eval):1> ../../csdiff_build/src/csgrep --remove-duplicates --filter-file ../../../tests/csgrep/0076-filter-file-basic-filter.json 0076-filter-file-basic-stdin.txt
+(eval):1> sed -e 's|"version": "[^"]*"|"version": ""|g'
../../../tests/csgrep/0076-filter-file-basic-filter.json: failed to open filter file

% ./sync.sh 0077-filter-file
+./sync.sh:5> . ../test-lib.sh
+../test-lib.sh:5> export JSFILTER_CMD='sed -e '\''s|"version": "[^"]*"|"version": ""|g'\'
+./sync.sh:7> [[ 1 -eq 0 ]]
+./sync.sh:10> tests=( 0077-filter-file ) 
+./sync.sh:13> tst=0077-filter-file
+./sync.sh:14> tst=0077-filter-file 
+./sync.sh:16> eval 'sed -e '\''s|"version": "[^"]*"|"version": ""|g'\'
./sync.sh:15: no such file or directory: 0077-filter-file-args.txt
+./sync.sh:15> eval '../../csdiff_build/src/csgrep  0077-filter-file-stdin.txt'
+(eval):1> sed -e 's|"version": "[^"]*"|"version": ""|g'
+(eval):1> ../../csdiff_build/src/csgrep 0077-filter-file-stdin.txt
0077-filter-file-stdin.txt: failed to open input file

[lzaoral]

The problem is present from the introduction of the 653f312 option and stems from the fact that ctest and sync.sh use a different working directory (thus simply fixing the path from sync.sh breaks ctest and vice-versa.).