Add some slack to screenshot tests.

app/build.gradle.kts

@@ -128,6 +128,11 @@ ktlint {
   version.set("1.5.0")
 }
 
+screenshotTests {
+  // Fraction of differing pixels tolerated before a screenshot test fails (0.0001 = 0.01%).
+  imageDifferenceThreshold = 0.0001f
+}
+
 android {
   namespace = "org.thoughtcrime.securesms"
 

feature/registration/build.gradle.kts

@@ -28,6 +28,11 @@ android {
   experimentalProperties["android.experimental.enableScreenshotTest"] = true
 }
 
+screenshotTests {
+  // Fraction of differing pixels tolerated before a screenshot test fails (0.0001 = 0.01%).
+  imageDifferenceThreshold = 0.0001f
+}
+
 wire {
   kotlin {
     javaInterop = true