Use /twres instead of /res for theme resources

AOSP and other ROM trees now do a rm -rf of the res folder during
the ramdisk creation process that removes the TWRP resources.
Using /twres instead of /res works around this issue making TWRP
more compatible with AOSP and other build trees.

Change-Id: I0d4c7e06ca381ac5aa0069b6f2b8c47f7dec49e7
diff --git a/minuitwrp/resources.c b/minuitwrp/resources.c
index bb30147..2e58311 100644
--- a/minuitwrp/resources.c
+++ b/minuitwrp/resources.c
@@ -59,7 +59,8 @@
     unsigned char header[8];
     int result = 0;
 
-    snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
+    snprintf(resPath, sizeof(resPath)-1, TWRES "images/%s.png", name);
+    printf("open_png %s\n", resPath);
     resPath[sizeof(resPath)-1] = '\0';
     FILE* fp = fopen(resPath, "rb");
     if (fp == NULL) {
@@ -261,7 +262,7 @@
     if (fp == NULL) {
         char resPath[256];
 
-        snprintf(resPath, sizeof(resPath)-1, "/res/images/%s", name);
+        snprintf(resPath, sizeof(resPath)-1, TWRES "images/%s", name);
         resPath[sizeof(resPath)-1] = '\0';
         fp = fopen(resPath, "rb");
         if (fp == NULL) {