default to Latency mode for fresh installs

This disables HDR+ by default on legacy 2nd and 3rd generation Pixels
which was undesirable but we no longer care about those devices. On
other devices, it makes more sense to use Latency mode to avoid waiting
for focus lock since other apps aren't doing it. Quality mode is still
there for people who want it. We expect more people will notice lower
Latency than the benefits of Quality mode, providing a better user
experience.

app/src/main/java/app/grapheneos/camera/CamConfig.kt

@@ -126,7 +126,7 @@ class CamConfig(private val mActivity: MainActivity) {
 
             const val FLASH_MODE = ImageCapture.FLASH_MODE_OFF
 
-            const val EMPHASIS_ON_QUALITY = true
+            const val EMPHASIS_ON_QUALITY = false
 
             const val FOCUS_TIMEOUT = "5s"