mobile: fix gradle invocation with sh

The current directory is not considered part of the PATH, hence it was
failing on the GitHub Actions runners.

mobile/gradle.js

@@ -5,13 +5,11 @@ const os = require("os");
 function runAndroidTest(args) {
   const platform = os.platform();
 
-  let baseCommand = platform === "win32" ? "gradlew.bat" : "gradlew";
+  let baseCommand = platform === "win32" ? "gradlew.bat" : "./gradlew";
 
   const command = `${baseCommand} ${args.join(" ")}`;
 
   try {
-    execSync("pwd", { stdio: "inherit", cwd: "android" });
-    execSync("ls", { stdio: "inherit", cwd: "android" });
     const output = execSync(command, { stdio: "inherit", cwd: "android" });
     if (output && output.toString()) {
       console.log(output.toString());