[librsvg-oci-images] debian: fix paths for sh shell

[Jordan Petridis <jpetridis src gnome org>]

commit c7269191803450737023a1ca24cb31a045003594
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Apr 7 18:51:53 2019 +0300

    debian: fix paths for sh shell

 debian/i386_testing | 4 ++--
 debian/testing      | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/debian/i386_testing b/debian/i386_testing
index 7e56249..c32ab15 100644
--- a/debian/i386_testing
+++ b/debian/i386_testing
@@ -2,5 +2,5 @@ FROM i386/debian:testing
 
 COPY prepare.sh cleanup.sh /root/
 
-RUN /usr/bin/sh /root/prepare.sh && \
-    /usr/bin/sh /root/cleanup.sh
\ No newline at end of file
+RUN /bin/sh /root/prepare.sh && \
+    /bin/sh /root/cleanup.sh
diff --git a/debian/testing b/debian/testing
index d3ad847..0568501 100644
--- a/debian/testing
+++ b/debian/testing
@@ -2,5 +2,5 @@ FROM debian:testing
 
 COPY prepare.sh cleanup.sh /root/
 
-RUN /usr/bin/sh /root/prepare.sh && \
-    /usr/bin/sh /root/cleanup.sh
+RUN /bin/sh /root/prepare.sh && \
+    /bin/sh /root/cleanup.sh