Improve test invocation, fix Retro Shift bugs, and add Auto+Retro Shift test cases (#15889)

tests/test_common/build.mk

@@ -13,4 +13,4 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-CUSTOM_MATRIX=yes
+CUSTOM_MATRIX=yes

tests/test_common/main.cpp

@@ -29,4 +29,4 @@ int main(int argc, char **argv) {
     init_logging();
 
     return RUN_ALL_TESTS();
-}
+}

tests/test_common/test_common.h

@@ -1,4 +1,4 @@
 #pragma once
 
 #define MATRIX_ROWS 4
-#define MATRIX_COLS 10
+#define MATRIX_COLS 10