skqp/.../assets/.gitignore: remove important things

Change-Id: Iabe82a2404d4119b1464a62729fdc04ee0b0e765
Reviewed-on: https://skia-review.googlesource.com/c/165309
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/platform_tools/android/apps/skqp/src/main/assets/.gitignore b/platform_tools/android/apps/skqp/src/main/assets/.gitignore
index 036d7bb..bd378b7 100644
--- a/platform_tools/android/apps/skqp/src/main/assets/.gitignore
+++ b/platform_tools/android/apps/skqp/src/main/assets/.gitignore
@@ -1,4 +1,2 @@
 /gmkb
-/skqp
-/files.txt
 /resources