Increase contast between text and placeholder in input fields

Signed-off-by: Julius Härtl <jus@bitgrid.net>

core/css/inputs.scss

@@ -52,7 +52,7 @@ div[contenteditable=true],
 	padding: 7px 6px;
 	font-size: 13px;
 	background-color: var(--color-main-background);
-	color: var(--color-text-lighter);
+	color: var(--color-main-text);
 	border: 1px solid var(--color-border-dark);
 	outline: none;
 	border-radius: var(--border-radius);
@@ -934,3 +934,9 @@ label.infield {
 	height: 1px;
 	overflow: hidden;
 }
+
+::placeholder,
+::-ms-input-placeholder,
+::-webkit-input-placeholder {
+	color: var(--color-text-maxcontrast);
+}