gradle: Apply suggestion from android studio

src/xrt/targets/openxr_android/build.gradle

@@ -24,7 +24,7 @@ androidGitVersion {
 def parseOpenXRVersion(def fn) {
     def matches = file(fn).readLines().find {
         it.contains('XR_CURRENT_API_VERSION')
-    } =~ ~/XR_MAKE_VERSION\(([^\)]+)\)/
+    } =~ ~/XR_MAKE_VERSION\(([^)]+)\)/
     def components = matches[0][1].split(',').each { it.replace(' ', '').trim() }
     String.join('.', components)
 }