[Snippets] Fix text-to-image fetch snippets (#1317)

with @Wauplin, we realized that some `text-to-image` js snippets were
incorrect, the key use to pass the prompt is different from a provider
to another, so it's better to get the inputs from the body instead.

**EDIT**: this PR does not fix totally the issue, since the input keys
are customized per provider in the `textToImage` function. This is fixed
in #1315.

**EDIT 2**: in a later PR we will apply a linter on the generated
snippets which should make the snippets much nicer!

Author: hanouticelina

packages/inference/src/snippets/templates/js/fetch/textToImage.jinja

@@ -14,6 +14,7 @@ async function query(data) {
 	return result;
 }
 
-query({ inputs: {{ providerInputs.asObj.inputs }} }).then((response) => {
+
+query({ {{ providerInputs.asTsString }} }).then((response) => {
     // Use image
 });

packages/tasks-gen/snippets-fixtures/text-to-image/js/fetch/0.fal-ai.js

@@ -14,6 +14,7 @@ async function query(data) {
 	return result;
 }
 
-query({ inputs: "Astronaut riding a horse" }).then((response) => {
+
+query({     inputs: "\"Astronaut riding a horse\"", }).then((response) => {
     // Use image
 });

packages/tasks-gen/snippets-fixtures/text-to-image/js/fetch/0.hf-inference.js

@@ -14,6 +14,7 @@ async function query(data) {
 	return result;
 }
 
-query({ inputs: "Astronaut riding a horse" }).then((response) => {
+
+query({     inputs: "\"Astronaut riding a horse\"", }).then((response) => {
     // Use image
 });