Use CFBundleExecutable instead of CFBundleName to construct executable path

Apparently some app archives might miss the CFBundleName key in the Info.plist.
This caused ideviceinstaller to fail. The correct key to use is
CFBundleExecutable which is apparently also used by the device itself to
construct the right path. This should fix compatibility with some app archives.
diff --git a/src/ideviceinstaller.c b/src/ideviceinstaller.c
index 1d3f383..79961e1 100644
--- a/src/ideviceinstaller.c
+++ b/src/ideviceinstaller.c
@@ -633,7 +633,6 @@
 				free(zbuf);
 			}
 
-			/* we need to get the CFBundleName first */
 			plist_t info = NULL;
 			zbuf = NULL;
 			len = 0;
@@ -693,27 +692,27 @@
 				goto leave_cleanup;
 			}
 
-			char *bundlename = NULL;
+			char *bundleexecutable = NULL;
 
-			plist_t bname = plist_dict_get_item(info, "CFBundleName");
+			plist_t bname = plist_dict_get_item(info, "CFBundleExecutable");
 			if (bname) {
-				plist_get_string_val(bname, &bundlename);
+				plist_get_string_val(bname, &bundleexecutable);
 			}
 			plist_free(info);
 
-			if (!bundlename) {
-				fprintf(stderr, "Could not determine CFBundleName!\n");
+			if (!bundleexecutable) {
+				fprintf(stderr, "Could not determine value for CFBundleExecutable!\n");
 				zip_unchange_all(zf);
 				zip_close(zf);
 				goto leave_cleanup;
 			}
 
 			char *sinfname = NULL;
-		       	if (asprintf(&sinfname, "Payload/%s.app/SC_Info/%s.sinf", bundlename, bundlename) < 0) {
+		       	if (asprintf(&sinfname, "Payload/%s.app/SC_Info/%s.sinf", bundleexecutable, bundleexecutable) < 0) {
 				fprintf(stderr, "Out of memory!?\n");
 				goto leave_cleanup;
 			}
-			free(bundlename);
+			free(bundleexecutable);
 
 			/* extract .sinf from package */
 			zbuf = NULL;