t: use consistent tabbing in tests

Problem: t0090-content-enospc.t used inconsistent tabs vs spaces.

Tabify everything.

t/t0090-content-enospc.t

@@ -30,8 +30,8 @@ test_expect_success 'flux still operates with content-sqlite running out of spac
 	    -o,-Scontent.backing-module=content-sqlite \
 	    -o,-Sstatedir=/test/tmpfs-1m/statedir \
 	    "./fillstatedir.sh; flux dmesg; flux run echo helloworld" > sql.out 2> sql.err &&
-        grep -q "No space left on device" sql.out &&
-        grep "helloworld" sql.out
+	grep -q "No space left on device" sql.out &&
+	grep "helloworld" sql.out
 '
 
 # flux start will fail b/c rc3 will fail due to ENOSPC
@@ -42,8 +42,8 @@ test_expect_success 'flux still operates with content-files running out of space
 	    -o,-Scontent.backing-module=content-files \
 	    -o,-Sstatedir=/test/tmpfs-1m/statedir \
 	    "./fillstatedir.sh; flux dmesg; flux run echo helloworld" > files.out 2> files.err &&
-        grep -q "No space left on device" files.out &&
-        grep "helloworld" files.out
+	grep -q "No space left on device" files.out &&
+	grep "helloworld" files.out
 '
 
 # flux start will fail b/c rc3 will fail due to ENOSPC
@@ -54,8 +54,8 @@ test_expect_success 'content flush returns error on ENOSPC' '
 	    -o,-Scontent.backing-module=content-sqlite \
 	    -o,-Sstatedir=/test/tmpfs-1m/statedir \
 	    "./fillstatedir.sh; flux dmesg; flux content flush" > flush.out 2> flush.err &&
-        grep -q "No space left on device" flush.out &&
-        grep "content.flush: No space left on device" flush.err
+	grep -q "No space left on device" flush.out &&
+	grep "content.flush: No space left on device" flush.err
 '
 
 test_done