Fixed incorrect lookup of gradle properties file

Prior, tests couldn't reach the configured server, because the custom URL
and credentials are simply ignored.

247d085 introduced an alternative parsing of the same values, but from
.gradle/config.properties.

Later, 5fd2e29 came and changed that testInstrumentationRunnerArgument
wasn't taking these values from the gradle.properties but instead from the
otherwise unused config.properties.

Signed-off-by: Philipp Hasper <[email protected]>

Author: PhilLab

app/build.gradle.kts

@@ -75,7 +75,7 @@ val ndkEnv = buildMap {
 }
 
 val configProps = Properties().apply {
-    val file = rootProject.file(".gradle/config.properties")
+    val file = rootProject.file("gradle.properties")
     if (file.exists()) load(FileInputStream(file))
 }