Tests: Don't enable HW accel as side-effect (#557)

The Settings test attempts to test the class by changing settings
variables and reading them back again. Problem is, that affects
the REST of the unit tests. So instead of enabling HW accel and
causing crashes, we'll diddle something innocuous, like OMP_THREADS.

tests/Settings_Tests.cpp

@@ -41,7 +41,7 @@ TEST(Settings_Default_Constructor)
 	// Create an empty color
 	Settings *s = Settings::Instance();
 
-	CHECK_EQUAL(0, s->HARDWARE_DECODER);
+	CHECK_EQUAL(12, s->OMP_THREADS);
 	CHECK_EQUAL(false, s->HIGH_QUALITY_SCALING);
 	CHECK_EQUAL(false, s->WAIT_FOR_VIDEO_PROCESSING_TASK);
 }
@@ -50,15 +50,15 @@ TEST(Settings_Change_Settings)
 {
 	// Create an empty color
 	Settings *s = Settings::Instance();
-	s->HARDWARE_DECODER = 1;
+	s->OMP_THREADS = 8;
 	s->HIGH_QUALITY_SCALING = true;
 	s->WAIT_FOR_VIDEO_PROCESSING_TASK = true;
 
-	CHECK_EQUAL(1, s->HARDWARE_DECODER);
+	CHECK_EQUAL(8, s->OMP_THREADS);
 	CHECK_EQUAL(true, s->HIGH_QUALITY_SCALING);
 	CHECK_EQUAL(true, s->WAIT_FOR_VIDEO_PROCESSING_TASK);
 
-	CHECK_EQUAL(1, s->HARDWARE_DECODER);
+	CHECK_EQUAL(8, Settings::Instance()->OMP_THREADS);
 	CHECK_EQUAL(true, Settings::Instance()->HIGH_QUALITY_SCALING);
 	CHECK_EQUAL(true, Settings::Instance()->WAIT_FOR_VIDEO_PROCESSING_TASK);
 }