[fuchsia] Fix paths to find and ls (#28280)

packages/fuchsia_remote_debug_protocol/lib/src/fuchsia_remote_connection.dart

@@ -526,14 +526,14 @@ class FuchsiaRemoteConnection {
   /// attempting to acquire the ports.
   Future<List<int>> getDeviceServicePorts() async {
     final List<String> portPaths = await _sshCommandRunner
-        .run('/system/bin/find /hub -name vmservice-port');
+        .run('/bin/find /hub -name vmservice-port');
     final List<int> ports = <int>[];
     for (String path in portPaths) {
       if (path == '') {
         continue;
       }
       final List<String> lsOutput =
-          await _sshCommandRunner.run('/system/bin/ls $path');
+          await _sshCommandRunner.run('/bin/ls $path');
       for (String line in lsOutput) {
         if (line == '') {
           continue;

packages/fuchsia_remote_debug_protocol/test/fuchsia_remote_connection_test.dart

@@ -21,10 +21,10 @@ void main() {
     setUp(() {
       mockRunner = MockSshCommandRunner();
       // Adds some extra junk to make sure the strings will be cleaned up.
-      when(mockRunner.run(argThat(startsWith('/system/bin/find')))).thenAnswer(
+      when(mockRunner.run(argThat(startsWith('/bin/find')))).thenAnswer(
           (_) => Future<List<String>>.value(
               <String>['/hub/blah/blah/blah/vmservice-port\n']));
-      when(mockRunner.run(argThat(startsWith('/system/bin/ls')))).thenAnswer(
+      when(mockRunner.run(argThat(startsWith('/bin/ls')))).thenAnswer(
           (_) => Future<List<String>>.value(
               <String>['123\n\n\n', '456  ', '789']));
       const String address = 'fe80::8eae:4cff:fef4:9247';