fix: minor gradle changes (#18)

Author: ucswift

android/build.gradle

@@ -18,7 +18,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:8.0.0'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${$kotlinVersion}"
     }
 }
 
@@ -64,12 +64,12 @@ repositories {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation project(':capacitor-android')
-    implementation "androidx.appcompat:appcompat:$androidxAppCompatVersion"
-    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "androidx.appcompat:appcompat:${androidxAppCompatVersion}"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:${kotlin_version}"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:${coroutinesVersion}"
     implementation 'com.google.android.material:material:1.6.1'
     implementation 'androidx.appcompat:appcompat:1.4.2'
-    implementation "androidx.core:core-ktx:$coreKtx"
+    implementation "androidx.core:core-ktx:${coreKtx}"
     implementation "androidx.activity:activity-ktx:1.5.1"
     implementation 'androidx.fragment:fragment-ktx:1.5.1'
     implementation "androidx.viewpager2:viewpager2:1.0.0"
@@ -116,7 +116,7 @@ dependencies {
     //def moshi_version = "1.12.0"
     //implementation "com.squareup.moshi:moshi:$moshi_version"
     //implementation "com.squareup.moshi:moshi-kotlin:$moshi_version"
-    testImplementation "junit:junit:$junitVersion"
-    androidTestImplementation "androidx.test.ext:junit:$androidxJunitVersion"
-    androidTestImplementation "androidx.test.espresso:espresso-core:$androidxEspressoCoreVersion"
+    testImplementation "junit:junit:${junitVersion}"
+    androidTestImplementation "androidx.test.ext:junit:${androidxJunitVersion}"
+    androidTestImplementation "androidx.test.espresso:espresso-core:${androidxEspressoCoreVersion}"
 }