Allow leading whitespace for keyword expressions

E.g.: ` bz 1234` should now work the same as `bz 1234`.

src/ffoo/saturnin_urimagic.sh

@@ -110,7 +110,7 @@ __saturnin_urimagic__flt_kws() {
     #
     # Hack out lines that look like kw expressions
     #
-    grep -Ee '^[a-zA-Z]\w*\s+[^=]' -e '^[a-zA-Z]\w*$'
+    grep -Ee '^\s*[a-zA-Z]\w*\s+[^=]' -e '^\s*[a-zA-Z]\w*$'
 }
 
 __saturnin_urimagic__flt_tags() {