Project property value can only be strings.

Fix
> Failed to notify project evaluation listener.
   > Could not create task ':element-android:matrix-sdk-android:compileDebugAndroidTestKotlin'.
      > Could not create task of type 'KotlinCompile'.
         > class java.util.LinkedHashMap cannot be cast to class java.lang.String (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap')

coverage.gradle

@@ -80,12 +80,12 @@ task generateCoverageReport(type: JacocoReport) {
 
 task unitTestsWithCoverage(type: GradleBuild) {
     // the 7.1.3 android gradle plugin has a bug where enableTestCoverage generates invalid coverage
-    startParameter.projectProperties.coverage = [enableTestCoverage: false]
+    startParameter.projectProperties.coverage = "false"
     tasks = ['testDebugUnitTest']
 }
 
 task instrumentationTestsWithCoverage(type: GradleBuild) {
-    startParameter.projectProperties.coverage = [enableTestCoverage: true]
+    startParameter.projectProperties.coverage = "true"
     startParameter.projectProperties['android.testInstrumentationRunnerArguments.notPackage'] = 'im.vector.app.ui'
     tasks = [':vector-app:connectedGplayDebugAndroidTest', ':vector:connectedDebugAndroidTest', 'matrix-sdk-android:connectedDebugAndroidTest']
 }

matrix-sdk-android/build.gradle

@@ -81,7 +81,7 @@ android {
     buildTypes {
         debug {
             if (project.hasProperty("coverage")) {
-                testCoverageEnabled = coverage.enableTestCoverage
+                testCoverageEnabled = coverage == "true"
             }
             // Set to true to log privacy or sensible data, such as token
             buildConfigField "boolean", "LOG_PRIVATE_DATA", project.property("vector.debugPrivateData")

vector-app/build.gradle

@@ -232,7 +232,7 @@ android {
             resValue "color", "launcher_background", "#0DBD8B"
 
             if (project.hasProperty("coverage")) {
-                testCoverageEnabled = coverage.enableTestCoverage
+                testCoverageEnabled = coverage == "true"
             }
         }
 

vector/build.gradle

@@ -69,7 +69,7 @@ android {
     buildTypes {
         debug {
             if (project.hasProperty("coverage")) {
-                testCoverageEnabled = coverage.enableTestCoverage
+                testCoverageEnabled = coverage == "true"
             }
         }
     }