Treat $ as proper search query

When $ is the leading character in a query, it's probably not meant to
be an anchor.

src/pattern.go

@@ -175,7 +175,7 @@ func parseTerms(fuzzy bool, caseMode Case, normalize bool, str string) []termSet
 			text = text[1:]
 		}
 
-		if strings.HasSuffix(text, "$") {
+		if text != "$" && strings.HasSuffix(text, "$") {
 			if strings.HasSuffix(text, "\\$") {
 				text = text[:len(text)-2] + "$"
 			} else {

src/pattern_test.go

@@ -58,7 +58,7 @@ func TestParseTermsExtendedExact(t *testing.T) {
 }
 
 func TestParseTermsEmpty(t *testing.T) {
-	terms := parseTerms(true, CaseSmart, false, "' $ ^ !' !^ !$")
+	terms := parseTerms(true, CaseSmart, false, "' ^ !' !^")
 	if len(terms) != 0 {
 		t.Errorf("%s", terms)
 	}